01 -
Preheat oven to 350°F. Line a 9x9-inch baking pan with parchment paper, leaving an overhang for easy removal. In a large bowl, beat softened butter and granulated sugar until creamy. Stir in flour and salt until a dough forms.
02 -
Press dough evenly into the bottom of the prepared pan, pressing slightly up the sides by about 1/3 inch. Bake for 20 minutes, or until the surface looks set and the edges are lightly golden. Remove from oven and gently prick the top with a fork.
03 -
While the base is baking, puree fresh raspberries in a blender or food processor. Optional: push puree through a fine mesh sieve to remove seeds. Transfer to a saucepan and simmer over medium heat, stirring frequently, until reduced to a thick consistency, about 5-7 minutes. Let cool to room temperature.
04 -
In a large bowl, whisk eggs and granulated sugar until well combined. Whisk in thickened raspberry puree, lemon juice, and cornstarch until smooth.
05 -
Pour the custard mixture over the baked shortbread base. Return pan to the oven and bake at 350°F for 22-26 minutes, or until the center is just set. Remove from oven and cool completely at room temperature.
06 -
Refrigerate for at least 2 hours before slicing. When ready to serve, dust with powdered sugar and, if desired, top with whipped cream.