Lemon Squares Recipe
A bright lemon layer that holds its shape when cut, set over a buttery shortbread base.
How Do You Keep Lemon Squares from Falling Apart?
These lemon squares begin with a crisp base made from butter, flour, and confectioners’ sugar. A filling of fresh lemon juice, eggs, sugar, and a little flour is poured over the base and baked until the center is set. Cool briefly, then refrigerate for at least two hours for clean slices; dust with confectioners’ sugar just before serving.
- Yield
- 1 20 × 20 cm square pan, 16 square pieces
- Servings
- 16 servings
- Total time
- 1 hr 10 min
- Difficulty
- Medium
- Prep time
- 25 min
- Cook time
- 45 minCool and Refrigerate: At least 2 hr 30 min, ideally 3 hr
Ingredients for Lemon Squares
For the Crisp Base
For the lemon filling
How to Make Lemon Squares
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01
Prepare the pan and oven
5 minutesLine the bottom and two opposite sides of a 20 × 20 cm square pan with parchment paper, leaving an overhang. Preheat the oven to 170°C conventional setting, without the fan.
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02
Combine the shortbread mixture
8 minutesMix 180 g flour, 45 g powdered sugar and 1/4 teaspoon fine salt. Add 110 g cold butter, cut into small cubes, and briefly work it in with your fingertips or a pastry cutter until sandy crumbs form; do not knead continuously into an elastic dough.
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03
Press and par-bake the crust
20–22 minutesSpread the crumb mixture evenly over the bottom of the pan and press it down with the back of a spoon. Bake on the middle rack at 170°C conventional setting for approximately 20–22 minutes, until the edges turn lightly golden. The crust can remain in the oven while you prepare the filling.
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04
Prepare the lemon zest and juice
5 minutesFinely grate the yellow outer zest only from 2 washed lemons. Juice the lemons, strain out the seeds, and measure 120 ml freshly squeezed lemon juice; use additional lemons if needed.
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05
Mix the dry ingredients for the lemon filling
3 minutesWhisk 200 g granulated sugar and the 30 g flour reserved for the filling together in a deep bowl while still dry. This reduces the risk of lumps in the next step.
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06
Add the eggs and lemon
4 minutesAdd 4 large eggs to the dry mixture one at a time, whisking just until combined. Add 120 ml lemon juice and the finely grated yellow zest, then whisk until smooth. Mix without creating too much foam; if large bubbles form on the surface, skim them off with a spoon.
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07
Bake the filling layer
22–25 minutesSlowly pour the filling over the hot-to-warm prebaked crust. Immediately place the pan on the middle rack of an oven set to 170°C with conventional top-and-bottom heat. Bake for approximately 22–25 minutes, until the edges are set and the center is firm enough that it no longer flows. Remove it before unnecessary browning occurs.
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08
Let cool slightly, then chill
At least 150 minutes of passive chillingTransfer the pan to a wire rack; let it cool at room temperature for 20–30 minutes, then refrigerate it without exceeding this time. Cover the dessert appropriately and chill it for at least 2 hours, or 2.5 hours if possible for clean cuts. This resting time is not included in the active cooking time.
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09
Cut into squares and serve
5 minutesLift the chilled dessert from the pan using the overhanging edges of the parchment paper. Cut it into 16 square pieces in a 4 × 4 arrangement with a clean, sharp knife. Dust the reserved 8 g of the 53 g powdered sugar from the first ingredient group over the top through a fine sieve, then serve chilled.
Mastery Guide
Review the technical details, common mistakes and correct practices that determine the recipe result.
Critical Tips
Prebake the crust
An unbaked crust may absorb the lemon filling and merge with the top layer, leaving a loose base.
Best practice: Bake the crust for 20–22 minutes before adding the filling, until the edges are lightly golden.
Use the Lemon Zest
The white pith can add bitterness to the bright citrus flavor.
Best practice: Use a fine grater to remove only the yellow surface, and measure the lemon juice before adding it.
Check the Center of the Filling
If the center is still liquid while the edges are cooked, the slices will not hold their shape.
Best practice: The center should not be runny when you remove it from the oven; it should show only a slight jiggle when you gently shake the pan.
Do Not Slice Before Chilling
The hot egg layer will spread under the knife.
Best practice: After it has cooled slightly, chill it in the refrigerator for at least 120 minutes, then use a sharp knife.
Common Mistakes
Choosing a Pan That Is Too Large
A thin layer of filling will dry out early, and the base may become overly hard instead of crisp.
Best practice: Use the specified 20 × 20 cm pan; recalculate the ratios for a different pan.
Whisking Too Much Air into the Filling
Large bubbles can expand in the oven, leaving a rough surface and uneven bubbles.
Best practice: Instead of foaming the eggs and sugar with a mixer, whisk them together with a wire whisk until smooth.
Adding Lemon Without Measuring the Juice
Because lemon size and juice content vary, the acid-to-liquid ratio can be thrown off.
Best practice: Measure 120 ml of the juice for the filling in a separate bowl.
Waiting for the Surface to Brown Too Much
Overbaking the lemon filling can create a rubbery egg texture.
Best practice: Do not try to make the surface dark brown; finish baking once the center has set.
Why Does This Happen?
How Do Eggs Set the Filling?
When heated, egg proteins coagulate and turn the liquid lemon mixture into a sliceable, tender network.
Best practice: Bake the filling over controlled heat until the edges are set but the center remains moist.
Why Add a Little Flour?
The starch in the flour binds the filling’s free moisture and supports the egg gel.
Best practice: Distribute 30 g flour evenly without lumps; too much can make the filling cake-like.
Why Does Cold Butter Create a Short, Crumbly Texture?
It creates small fat particles around the flour, helping form a short, easily crumbled texture.
Best practice: Work the cold butter into the flour without overkneading, then press the mixture into the pan.
Why Does Lemon Zest Smell So Strong?
The aromatic oils in the outer yellow zest have a stronger scent than the juice.
Best practice: Finely grate the yellow zest into the filling; do not include the white pith.
Mayana Tips
Leave Parchment Paper Handles
The soft lemon layer can break when lifted by hand from the pan, even after it has cooled.
Best practice: Place the parchment so it overhangs the pan on two sides; lift the fully cooled dessert using the paper.
Plan the Filling Workflow
If you prepare the filling while the crust pre-bakes, you can pour it over the hot crust without delay.
Best practice: Squeeze the lemon and mix the filling ingredients while the crust is in the oven.
Wipe the Knife After Every Cut
Traces of lemon cream left on the knife make the edge of the next piece look rough.
Best practice: Clean the thin, sharp knife after each cut and make 16 squares.
Add the Powdered Sugar at the Last Moment
Powdered sugar left on a moist surface melts and disappears.
Best practice: Just before serving, sift the reserved 8 g powdered sugar through a fine strainer.
Ingredients & Measurements
Weigh the Flour
The density of flour measured by volume changes the texture of the crust and filling.
Best practice: Measure 180 g flour for the crust and 30 g for the filling separately.
Use Large Eggs for Consistent Results
Smaller eggs contain less protein and water, which can change how the filling sets.
Best practice: Use 4 large eggs, each weighing approximately 50 g without the shell.
Do Not Cut the Sugar Suddenly
Sugar does more than add sweetness; it balances the acidity and keeps the egg layer moist.
Best practice: Keep the 200 g of sugar in the filling for the first attempt, then adjust the amount gradually to taste.
Prioritize Fresh Lemons
Bottled lemon juice does not always provide the same aromatic brightness as fresh fruit.
Best practice: Squeeze the juice fresh, strain out the seeds, and measure 120 ml.
Cooking Techniques
Preheat the Oven
A shortcrust base can lose fat during a long bake in a lukewarm oven.
Best practice: Preheat the oven to 170°C on the conventional setting, then place the pan on the middle rack.
Press the Base Evenly
An uneven crumb layer will be thick in some spots and too thin in others.
Best practice: Use the back of a spoon to press the corners and center to the same level; do not create a thick wall around the edges.
Keep the Filling at an Even Temperature
Excessive surface heat can create a cooked ring around the edges while the center remains soft.
Best practice: After adding the lemon filling, bake at 170°C on the conventional setting for approximately 22–25 minutes.
Cool It in the Pan
The hot filling is prone to cracking if you move it or remove it from the pan too soon.
Best practice: Let the pan cool on a heatproof wire rack for 20–30 minutes, then chill it in the refrigerator.
How to Store and Make Lemon Squares Ahead
- Serving temperature
Serve cold or slightly chilled after removing the lemon squares from the refrigerator.
- Best resting time
Cool in the pan for 20–30 minutes, then refrigerate for at least 120 minutes, or about 150 minutes for cleaner cuts.
- Refrigerator storage
Store the completely chilled dessert in a covered container at 4°C or below and eat within 3–4 days for the best quality and safety.
- Room-temperature limit
Because the filling contains eggs, do not leave the lemon squares at room temperature for more than 2 hours in total; in a hot environment, this limit drops to 1 hour.
- Freezing
Before dusting with confectioners’ sugar, wrap the cut bars individually and freeze them at -18°C for up to 2 months for best quality. The base may soften slightly after thawing.
- Thawing method
Thaw the wrapped frozen squares slowly in the refrigerator; do not refreeze them after thawing.
- Reheating
Do not reheat; the lemon layer may lose its texture. Serve cold.
- Make-ahead steps
Make the lemon squares 1 day ahead and keep them covered in the refrigerator. Dust with confectioners’ sugar and cut them close to serving time.
- Serving suggestion
Cut into 16 equal squares and transfer to a serving plate; sift the confectioners’ sugar over them just before serving.
Nutrition
1 serving: 1 square piece (1/16 of the recipe); including serving additions
Approximate values calculated per 1 square piece (1/16 of the recipe) using the listed ingredients and standard food composition data. Nutrition values are approximate and calculated using standard food composition averages.
Frequently Asked Questions About Lemon Squares
Why Is the Lemon Bar Filling Still Runny?
There may be too much lemon juice, the egg-to-flour balance may be off, the filling may be underbaked, or it may not have finished cooling. Use 120 ml of juice, check that the center is cooked, and chill it for at least 2 hours.
Does the Base for Lemon Bars Need to Be Prebaked?
Yes. Prebaking the butter shortcrust in a 170°C conventional oven for approximately 20–22 minutes helps it support the liquid filling added on top.
When should I cut the lemon bars?
Let them cool for 20–30 minutes, then chill them in the refrigerator for at least 2 hours. Slice the completely chilled dessert with a sharp, clean knife.
Does the lemon bar recipe require baking powder?
Not for this classic crisp crust and egg-set filling. A leavener is not necessary for the shortcrust or smooth lemon layer.
Can I use limes instead of lemons?
Yes, but the acidity and flavor will change. For your first attempt, still measure 120 ml of freshly squeezed juice and expect a more pronounced tart flavor.
How many days do lemon bars keep in the refrigerator?
Store them in an airtight container at 4°C or below for 3–4 days. Because they contain eggs, do not leave them at room temperature for more than two hours.
Can lemon bars be frozen?
Yes. Freeze the wrapped slices without powdered sugar for approximately two months for best quality. Thaw them in the refrigerator, then add the powdered sugar before serving.
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