Classic Lemon Bars
A proper lemon bar should offer a distinct contrast between a sandy, buttery base and a sharp, glass-smooth custard topping. Getting the balance right means prioritizing fresh zest and juice over shortcuts and being patient while the heat finishes its work on the counter.
Temperature control is your only enemy.
Use room temperature eggs for the filling to ensure they emulsify smoothly into the lemon juice without scrambling. Line your pan with parchment paper, leaving an overhang on the sides so you can lift the entire block out once chilled.
- 9x13 inch metal baking pan
- parchment paper
- whisk
- fine mesh sieve
- electric hand mixer
What goes in.
- 2 cupsall-purpose flour
- 1/2 cupgranulated sugar
- 1 cupunsalted butter, softened
- 2 cupsgranulated sugar (for filling)
- 1/2 cupall-purpose flour (for filling)
- 4large eggs
- 1 cupfreshly squeezed lemon juice
- 1 tbsplemon zest
Set the foundation
The crust must be pale golden and dry to the touch before the liquid filling hits it. If it remains soft, the lemon custard will seep into the butter, resulting in a soggy, indistinct base.
The method.
Prep the oven and pan
Preheat your oven to 350°F (175°C). Line the baking pan with parchment paper, smoothing it into the corners.
Mix the crust
Cream the butter and half-cup of sugar until combined. Add the flour and mix until the dough resembles damp crumbs. Press this firmly and evenly into the bottom of the pan.
Blind bake
Bake for 20 minutes or until the edges begin to turn a light, sandy gold. Remove and keep the oven on.
Prepare the filling
Whisk the remaining sugar and flour together. Add the eggs, lemon juice, and zest. Whisk until perfectly smooth; if you see clumps of flour, run the mixture through a fine mesh sieve.
Bake the bars
Pour the filling over the hot crust. Return to the oven for 20 to 25 minutes. Look for the edges to set and the center to wobble like gelatin when the pan is nudged.
Cooling
Let the pan sit on a wire rack until it reaches room temperature. Move to the refrigerator for at least two hours before attempting to slice.
Other turns to take.
Lime or Grapefruit
Replace the lemon juice and zest with equal parts fresh lime or ruby red grapefruit juice for a less acidic, more floral profile.
Shortbread boost
Add a pinch of sea salt to the crust dough to offset the intensity of the citrus topping.
When it doesn't go to plan.
Sift your powdered sugar over the top immediately before serving, rather than hours ahead, or it will dissolve into the damp surface of the custard.
Wipe your knife clean with a damp towel between every single cut to ensure the edges of the bars remain sharp and clean.
If the filling develops small bubbles on top, give the pan a sharp tap against the counter before sliding it into the oven.
The ones that keep coming up.
Why did my filling turn out runny?
The bars require a full chill cycle to set. If they are still liquid after chilling, they were likely pulled from the oven too early or the oven temperature was inaccurate.
Can I use bottled lemon juice?
Bottled juice contains preservatives and lacks the essential oils found in fresh zest. It will alter the flavor profile and often results in a flatter, more synthetic taste.
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