This Lemon Tart Costs 40p a Slice — Here's Exactly Why It Works

Desserts Budget Baking Pastry Lemon

Prep Time 50 mins

Cook Time 38 mins

Chill Time 2 hours

Serves 8

Cost Per Slice 40p

✅ Tested by Vinod Pandey — March 2026  |  Prices verified at Tesco  |  Tested 2 times before publishing

⚡ Quick Answer

Cost: £3.26 total / 40p per slice  |  Time: 50 mins prep + 38 mins baking + 2 hrs chilling  |  Serves: 8
A classic lemon tart with crisp sweet shortcrust pastry and a smooth, bright citrus filling — the whole thing costs under £3.30 to make. It needs patience during the filling stage (tempering eggs is not a step to rush), but there's nothing technically out of reach for a home baker.

📋 Table of Contents

1. Why This Lemon Tart Surprised Me
2. Why This Recipe Works
3. Your Real Questions, Answered First
4. Full Cost Breakdown
5. Ingredients
6. Making the Sweet Shortcrust Pastry
7. Making the Lemon Filling
8. Preparing the Tin and Rolling the Pastry
9. Blind Baking the Pastry Shell
10. Filling, Final Bake, and Chilling
11. What If It Goes Wrong?
12. Common Mistakes to Avoid
13. Is This Worth Making From Scratch?
14. What I Learned Making This
15. FAQ

Why This Lemon Tart Surprised Me

I made this lemon tart because I wanted to know whether the tempering step genuinely matters, or whether it's just the kind of instruction recipes include for tradition's sake. Total cost came in at £3.26 for a 9-inch tart that slices into 8 — that's 40p per slice. Prep runs about 50 minutes (including 30–60 minutes of chilling time for the pastry), bake time is around 38 minutes split across two stages, and the tart needs at least 2 hours in the fridge before it's ready to cut. One honest caveat: the filling stage is unhurried work. You're tempering eggs and stirring a custard-style mixture over low heat — it rewards attention, not speed.

The first time I made it, I added the warm lemon mixture to the eggs too quickly. The result was mostly smooth but had a few scrambled patches I had to strain out. The second time, I poured slowly and the filling came out noticeably cleaner — glassy, rather than slightly grainy at the edges. That difference alone answered my original question: yes, the tempering step matters.

🔬 Why This Recipe Works

The high egg-to-liquid ratio (4 whole eggs plus 2 yolks for a single tart) is what gives this filling its clean, sliceable set — rather than the wobbly, panna-cotta style you get with cream-heavy versions. Pre-thickening the filling on the hob before the final bake means you're not relying on oven heat alone to set it, which prevents the kind of overbaking that makes lemon tarts taste eggy. The blind bake creates a moisture barrier in the pastry, which is why the base stays crisp rather than going soggy under the wet filling.

You might be wondering whether the pastry is worth making from scratch when shop-bought shortcrust exists. Honestly, the homemade version is noticeably different here — it's sweeter, more biscuit-like, and holds the filling edge cleanly when sliced, which the plain ready-rolled kind doesn't always do. The other question worth answering early: do you need a loose-bottom tin? Not strictly, but without one, unmoulding risks cracking the shell. A 9-inch loose-bottom flan tin costs around £5–7 at most supermarkets and pays for itself quickly if you bake regularly.

Full Cost Breakdown

Ingredient	Amount	Cost
Pastry
Plain flour	150g	8p
Icing sugar	40g	10p
Butter (cold)	100g	76p
Egg	1	14p
Pastry total		£1.08
Filling
Eggs	6 (4 whole + 2 yolks)	84p
Lemons	3	30p
Caster sugar	150g	24p
Butter (softened)	115g	80p
Filling total		£2.18
Grand total		£3.26
Cost per slice (8 slices)		40p

💡 Price note: All costs checked at Tesco in March 2026. Prices vary by region, store, and season. Check your local supermarket for current prices.

Ingredients

🥧 For the Sweet Shortcrust Pastry

• 150g plain flour
• 40g icing sugar
• Pinch of salt
• 100g cold butter, cut into small cubes
• 1 egg
• 1 tbsp cold water (only if the dough feels dry)

🍋 For the Lemon Filling

• 6 eggs — 4 whole eggs plus 2 yolks
• 3 lemons — zest from 2, juice from all 3
• 150g caster sugar
• 115g softened butter

Making the Sweet Shortcrust Pastry

I wanted to find out whether using cold butter versus slightly softened butter made a noticeable difference to the pastry texture. It did. Cold butter rubbed in properly gave a finer, sandier crumb; slightly warmer butter started to turn greasy before it broke down fully and the texture was uneven. So keep the butter cold — straight from the fridge works best.

Step 1 — Mix the dry ingredients

Add 150g plain flour to a large bowl, then a good pinch of salt, then 40g icing sugar. Mix briefly with a spoon so the icing sugar doesn't sit in one clump. It looks plain at this stage — that's fine. The icing sugar is what gives the finished pastry that slightly sweet, biscuit-like edge rather than the plainer flavour of plain shortcrust.

Step 2 — Rub in the cold butter

Add 100g cold butter, cut into small cubes, to the bowl. Rub it into the flour mixture using your fingertips — lift the mixture as you rub so air gets in. You're working towards fine, even breadcrumbs with no visible chunks of butter. It takes about 2–3 minutes. The texture shifts from floury to sandy as you work; you'll feel it change. Stop once it's uniform — overworking this stage develops gluten and toughens the pastry.

Step 3 — Bind with egg, chill the dough

Crack 1 egg into the bowl and mix it through. Then tip the mixture onto a clean board and press it together. On my second test I deliberately skipped the water to see what happened — the dough held together but felt slightly resistant, almost reluctant, and cracked a little at the edges when shaped. Adding 1 tablespoon of cold water fixed that immediately. The dough relaxed without going sticky. Shape it into a flat disc, wrap it, and chill for 30–60 minutes. The chilling firms the butter back up, which is what stops the pastry shrinking dramatically in the tin.

Making the Lemon Filling

This filling is essentially a stirred lemon custard — butter and sugar melted with citrus, then thickened with eggs over low heat. The part I kept questioning before trying it properly was the straining step. Could you skip it and still get a clean result? I tested it both ways. Without straining, the filling had a slightly rougher appearance and a couple of small cooked egg fragments that didn't break down during stirring. With straining, it was visibly smoother and cut more cleanly once chilled. Worth the extra 30 seconds.

Step 4 — Melt butter, sugar, zest, and juice

Add 115g softened butter, 150g caster sugar, the zest of 2 lemons, and the juice of all 3 lemons to a saucepan. Place it on a low heat and stir occasionally while everything melts together. The mixture turns from separate ingredients to a glossy, fragrant liquid over about 5–7 minutes. Keep the heat gentle — high heat at this stage can cause the sugar to catch at the edges of the pan before the butter has fully melted in.

Step 5 — Whisk the eggs

While the lemon mixture warms, crack 4 whole eggs into a bowl, then add only the yolks from the remaining 2 eggs. Keep the whites in a separate container in the fridge — they're useful for meringues, mousse, or a simple egg-white omelette later. Whisk the eggs just until the whites and yolks are fully combined. You're not aiming for foam or volume here, just a smooth, uniform mixture. Over-whisked eggs can introduce air that makes the filling bubble during baking.

Step 6 — Temper, strain, and thicken

Take the lemon pan off the heat and let it cool for a minute or two. Then pour a small amount — about 2–3 tablespoons — of the warm lemon mixture into the eggs while whisking continuously. Add a little more, whisk again. Keep going in small additions until everything is combined. This gradual addition is what prevents the eggs from scrambling on contact with the hot liquid. My first attempt, where I added too much too quickly, produced a mostly-smooth filling but with a few visible cooked egg threads. The second time, slow pouring with constant whisking gave a completely clean result.

Once combined, strain the mixture through a fine sieve back into the saucepan — pressing any lumps through but leaving any cooked bits behind. Return to a low heat and stir continuously. The filling will thicken noticeably after about 4–6 minutes. You'll know it's ready when it coats the back of a spoon and holds a clear line if you draw your finger through it.

💡 Keep the heat low and keep stirring. The filling thickens fast right at the end — step away for 30 seconds and it can go from perfect to slightly overcooked at the edges.

Preparing the Tin and Rolling Out the Pastry

Use a 9-inch loose-bottom flan tin. The loose base makes unmoulding much easier and reduces the risk of cracking the tart shell when you try to lift it. Cut a circle of greaseproof paper to fit the base — folding the paper into quarters and trimming a curved edge is the quickest method. Then rub a small amount of lard (or softened butter) over the base and sides. Not a thick coat, just enough to prevent sticking in any corners.

Flour your board and rolling pin generously. Roll the chilled dough into a circle slightly larger than the tin, aiming for an even thickness throughout — about 3–4mm. Thin enough that it doesn't feel stodgy against the filling, thick enough that it holds its shape. Transfer by draping the pastry over the rolling pin, then unrolling it carefully across the tin. Lift the edges and press the pastry gently into the corners with your fingertips. Trim any large overhang with a knife — a small lip above the tin edge is fine as it shrinks slightly during baking.

Blind Baking the Pastry Shell

Blind baking sets the pastry shape and dries out the base before the wet filling goes in. Without it, the bottom goes soft — not immediately, but by the time the tart is sliced and plated, it lacks that distinct crispness that makes a proper tart worth making. Scrunch up a sheet of greaseproof paper (scrunching helps it conform to the corners rather than sitting flat), lay it over the pastry, and fill it with baking weights or dry rice. Dedicated baking rice kept separately works perfectly — the same 500g bag can be used dozens of times.

Bake at 175°C (fan: around 160°C) for 20 minutes. Then lift out the paper and weights and return the tin to the oven for another 10 minutes to dry out and lightly colour the base. You're looking for an even, pale golden colour — not white and underdone, not deep brown.

Filling, Final Bake, and Chilling

Let the thickened filling cool for 10 minutes before pouring it into the baked shell — pouring it too hot can cause the pastry to soften slightly before it sets. Pour it in slowly, filling right to the top. The combined smell of lemon, sugar, and warm pastry at this point is genuinely one of the better kitchen moments.

Bake the filled tart at 170°C (fan: 155°C) for 8–10 minutes. You're not cooking the filling through at this point — it was already thickened on the hob. This final bake just sets the surface and creates a very slight skin that helps the tart slice cleanly. When you remove it, the centre should wobble gently if you shake the tin, while the edges look firmer and more set. That wobble disappears during chilling.

Leave the tart to cool completely at room temperature first, then refrigerate for at least 2 hours. Trying to slice it before it's fully cold results in the filling sliding rather than cutting. Once chilled, push up the loose base, slide the tart onto a plate, and dust lightly with icing sugar. Slice into 8 pieces with a sharp, thin-bladed knife — wiping the blade between cuts keeps the filling edges clean.

🛟 What If It Goes Wrong?

Filling has visible scrambled egg pieces: You added the warm lemon mixture too quickly. Strain the filling thoroughly through a fine sieve before returning it to the heat — most of the cooked fragments will be caught. The remaining mixture will still be usable and will set correctly. Next time, pour in very small additions and keep whisking constantly between each one.

Pastry shrank significantly in the tin during blind baking: The dough wasn't chilled long enough, or it was rolled too thin at the edges. A 30-minute chill is the minimum — 60 minutes is better, especially in a warm kitchen. Also check that you pressed the pastry firmly into the corners rather than stretching it in, as stretched pastry pulls back more during baking.

Tart base is soggy after chilling: The pastry was likely underbaked before the filling went in. The 10-minute uncovered bake after removing the weights is essential — the base should look dry and pale golden, not white and soft. If you're using a fan oven, reduce the temperature to 160°C and check earlier to avoid overbrowning the edges while the base catches up.

⚠️ Common Mistakes to Avoid

❌ Using warm butter for the pastry

Warm butter starts to melt before it's fully incorporated, creating a greasy, uneven dough that bakes into a heavier base. Cold butter from the fridge, cut into small cubes, rubs in properly and produces the sandy, crisp texture this pastry needs.

❌ Skipping the pre-thickening stage and going straight to the oven

If you pour a raw, unthickened egg mixture into the pastry shell and bake it from scratch, you risk an overcooked exterior before the centre is fully set — particularly with a rich, butter-heavy recipe like this. Pre-thickening on the hob gives you far more control over the final texture.

❌ Slicing before the tart is fully cold

Even if the tart looks set after cooling to room temperature, the filling is still softer than it will be once properly chilled. Cutting into it too early means the filling slides rather than holds its shape in the slice. Two hours in the fridge is the minimum — overnight is even better.

⚖️ Is This Worth Making From Scratch?

✅ YES — if:

You want a proper dessert that looks bakery-standard and costs under £3.30 total. The taste difference between a homemade lemon tart and a supermarket version is significant — the filling is brighter, sharper, and the pastry is actually crisp. A chilled Tesco lemon tart costs around £2.50 for a smaller 6-inch version, so you're getting more tart for less money and considerably better flavour. It's also worth it if you have the afternoon — the active hands-on time is only about 50 minutes; the rest is just waiting.

❌ SKIP IT — if:

You need a dessert in under an hour, or you don't have the patience for stirring a filling on the hob and waiting 2 hours for it to chill. This is not a quick recipe — it has several stages that genuinely can't be rushed. A shop-bought version is absolutely fine for a midweek pudding. Save this one for a weekend when the process itself is part of the point.

What I Learned Making This

The pastry surprised me a bit. With just the egg, it almost came together — but still felt slightly dry and cracked at the edges when I shaped it. Adding that one tablespoon of cold water made the difference. The dough relaxed without turning sticky. So I'd say: trust the feel of the dough over the recipe. If it's resisting, a careful drizzle of cold water fixes it.

Tempering the eggs was the other thing I kept questioning before I actually tried it both ways. I used to think people overstated how careful you needed to be. They don't. Adding warm liquid too quickly to eggs really does scramble them — I saw it happen on my first attempt. The slow whisking felt unnecessary in the moment, almost fussy, but the difference in the finished filling was visible. Second batch came out cleaner and sliced better. That's all the evidence I needed.

Straining also felt like a step designed for perfectionists. But even on my better second batch, the sieve caught a few small cooked fragments I hadn't noticed while stirring. The filling looked noticeably cleaner afterwards, and the final slices had a glassier edge where the filling met the pastry. Worth the extra 30 seconds every time. And those spare egg whites — I refrigerated them and used them in a simple meringue two days later. Nothing wasted.

Watch the Full Recipe Method

See each stage of the lemon tart — pastry, filling, blind baking, and the finished result — in the video below.

⚠️ Allergen & Food Safety Info

Contains: Gluten (wheat flour), Eggs, Dairy (butter). Store the finished tart covered in the fridge and consume within 3 days. Not suitable for freezing once the pastry is filled — the filling texture changes significantly after defrosting. Keep raw egg handling hygienic and wash hands after cracking eggs.
For UK allergen guidance, visit food.gov.uk.

📌 You Might Also Like

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• Budget Custard Tart — Crisp Pastry and Set Filling for 35p a Slice
• How to Make Sweet Shortcrust Pastry — The Reliable Method
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• Budget Fruit Tart — Same Pastry Shell, Summer Topping

Frequently Asked Questions

Can I use shop-bought shortcrust pastry instead of making it?

Yes, and it's a reasonable shortcut if you're short on time. A 375g ready-rolled sheet costs around 80–90p and will fit a 9-inch tin adequately. The flavour difference is noticeable — ready-made shortcrust is plainer and less sweet than this sweet shortcrust version — but the filling is strong enough to carry the tart even with a simpler base. The total cost will be slightly higher because you're buying a full pastry sheet rather than using measured ingredients.

Can I make the filling a day ahead?

Yes, the filling keeps well covered in the fridge for up to 24 hours before baking. If it firms up slightly overnight, warm it gently in the pan over a very low heat — stirring constantly — until it loosens back to a pourable consistency, then cool slightly before using. Don't overheat it or the texture can split.

Do I need a tart tin with a loose bottom?

A loose-bottom tin makes unmoulding significantly easier — without one, you either have to serve directly from the dish or risk cracking the pastry shell trying to lift it out. A 9-inch loose-bottom flan tin is available at most Tesco, Sainsbury's, and Lakeland branches for around £5–7 and is a versatile piece of kit that works for any tart or quiche. If you only have a solid-based tin, line it well and plan to serve from the dish.

Why does my pastry keep cracking when I roll it out?

Two likely causes: the dough is too dry (add cold water, 1 teaspoon at a time, pressing the dough firmly after each addition), or it was chilled too long and is too cold and rigid to roll. If it's very firm from the fridge, leave it at room temperature for 5–10 minutes before rolling. Cracks at the edges while rolling are normal and can be pressed back together with your fingers.

How long does the tart keep in the fridge?

Up to 3 days covered in the fridge. The pastry stays reasonably crisp for the first two days; by day three it softens slightly at the base where it's in contact with the filling. The filling itself holds its flavour and texture well throughout. Not suitable for freezing — the filling becomes grainy and the pastry loses its texture after defrosting.

Can I reduce the number of eggs to cut the cost further?

Not without affecting the set. The 4 whole eggs plus 2 yolks ratio is what gives the filling its firm, sliceable texture. Reducing to 3 whole eggs produces a softer result that slices less cleanly and has a more wobbly, quiche-like texture rather than the clean, glassy finish of a proper lemon tart. At 84p for 6 eggs from Tesco, the filling eggs work out at 14p each — not a meaningful saving to make by cutting them.

Final Thoughts

What stayed with me after making this twice was how much difference the small things made. The cold butter question — I'd always assumed it was one of those instructions people included out of habit. It isn't. The tempering question — same answer. The straining question — same again. Each step I tested by skipping it produced a noticeably worse result. Which is relatively unusual for baking recipes, where quite a few steps turn out to be optional when you actually test them.

For 40p a slice and roughly 50 minutes of active work, this is a genuinely good dessert — crisp pastry, bright filling, clean cut. The only honest caveat is the timeline: you need to plan for the chilling time, and you can't rush the filling on the hob. If those conditions suit your afternoon, it's well worth the effort.

If you make it, I'd be curious to know how your filling turned out — particularly whether you found the tempering stage as consequential as I did, or whether your kitchen conditions produced a different result. Leave a note below.

🍋

Made This Lemon Tart?

Tell me how it went in the comments — especially whether the tempering step gave you any trouble, and how your pastry held up after chilling. Always good to hear what actually happens in other people's kitchens.