03Pop the crust in the oven and bake until a light golden brown, about 20 minutes. Cool completely on a wire rack.04For the filling: While the crust is cooling, make your filling. Crack your eggs into a large bowl and add the sugar, lemon zest, lemon juice and flour. Whisk until combined. Pour into the crust and spread evenly. Put back in the oven and bake until the filling is completely set, about 30 minutes. Let cool to room temperature before serving.05Dust with confectioners' sugar and then cut into 20 to 24 squares to serve. Garnish with raspberries, if desired.