01 -
Preheat oven to 175°C. Combine all-purpose flour, powdered sugar, and fine salt in a mixing bowl. Add cold, cubed butter and blend with a pastry cutter or fingertips until the mixture resembles coarse crumbs. Line a rectangular baking pan with parchment paper and press the mixture firmly into the base, creating an even layer.
02 -
Bake the prepared crust in the preheated oven for 20 minutes, or until golden and crisp. Remove from oven and leave in the pan, ready for the filling.
03 -
In a separate bowl, whisk together granulated sugar, cornstarch, lemon zest, lemon juice, eggs, and baking powder. Mix until smooth and fully combined. The filling should be glossy and lump-free.
04 -
Pour the lemon filling evenly over the warm crust. Return the pan to the oven and bake for 20–25 minutes, until the filling is set and the edges are lightly golden. Do not overbake.
05 -
Allow to cool completely in the pan. Dust generously with powdered sugar. For extra flavour, drizzle a glaze made from powdered sugar and lemon juice if desired. Slice into squares and serve chilled or at room temperature.