Lemon Squares

🥘 Ingredients

• butter (unsalted, 113g, at room temperature)
  8 tablespoons
• confectioners' sugar (28g, 21g)
  1/4 cup, 3 tablespoons
• crust:*
• egg yolk (large)
  1
• eggs (large)
  4
• flour (king arthur unbleached all-purpose, 120g, king arthur unbleached all-purpose, 28g)
  1 1/4 cup
• granulated sugar (+ 2 tablespoons, 223g)
  1 cup
• lemon juice (152g)
  2/3 cup
• salt
  3/8 teaspoon
• sugars (snow white non-melting topping, or confectioners'; sugar for topping)
• topprecipe:applesauce bread ing:* (weight)

🍳 Cookware

• pan

1. 1

   Gather topprecipe:applesauce bread ing:* , granulated sugar , crust:* .

   topprecipe:applesauce bread ing:* (weight), granulated sugar: 1 cup (+ 2 tablespoons, 223g), crust:*
2. 2

   Preheat the oven to 350°F.
3. 3

   To make the crust: Whisk together the flour , salt , and confectioners' sugar . Work in the butter until it's evenly distributed; the mixture will be crumbly. Press the crust firmly into an ungreased 8" square pan . If the mixture begins to stick to your hands, chill in the freezer for ⏱️ 5-10 minutes , then continue to press into the pan. It's important that the crust is firmly anchored to the pan so no filling seeps underneath.

   flour: 1 cup (king arthur unbleached all-purpose, 120g), salt: 1/4 teaspoon, confectioners' sugar: 1/4 cup (28g), butter: 8 tablespoons (unsalted, 113g, at room temperature)
4. 4

   Bake the crust for ⏱️ 30-35 minutes , or until it's golden brown. Remove it from the oven, and reduce the oven temperature to 325°F.
5. 5

   While the crust is baking, make the topping: Combine the whole eggs , egg yolk , and sugars and whisk until smooth. Add the flour and salt , then the lemon juice , and whisk until thoroughly combined.

   eggs: 4 (large), egg yolk: 1 (large), sugars (snow white non-melting topping, or confectioners'; sugar for topping), flour: 1/4 cup (king arthur unbleached all-purpose, 28g), salt: 1/8 teaspoon, lemon juice: 2/3 cup (152g)
6. 6

   Let the filling sit for ⏱️ 15 minutes or so, until the bubbles (mostly) disappear.
7. 7

   While the baked crust is still hot, pour the topping over it. Return the bars to the oven and bake until they appear set and relatively dry on top, about ⏱️ 30 minutes .
8. 8

   Remove the bars from the oven, and cool them on a rack. Let them cool completely before slicing. Just before serving, sprinkle the top of the bars with confectioners' sugar .

   confectioners' sugar: 3 tablespoons (21g)
9. 9

   Store any leftovers in the refrigerator for up to several (3 to 4) days.