Ingredients:
- 1 ½ cups (192g) all-purpose flour, plus more for dusting
- ½ cup (113g) unsalted butter, cold and cubed
- ¼ cup (50g) granulated sugar
- 1 large egg yolk
- 1 teaspoon lemon zest
- Pinch of salt
- ½ cup (113g) unsalted butter, softened
- 1 cup (200g) granulated sugar
- 3 large eggs
- ½ cup (120ml) fresh lemon juice
- 2 tablespoons lemon zest
- Powdered sugar (optional)
Instructions:
- Combine flour, sugar, lemon zest, and salt in a bowl. Cut in the cold, cubed butter until the mixture resembles coarse crumbs. Add the egg yolk and mix until the dough just comes together.
- Flatten the dough into a disc, wrap in plastic wrap, and chill for at least 30 minutes.
- Preheat oven to 350°F (175°C).
- Press half the dough evenly into the bottom of the springform pan. Reserve the remaining dough.
- Bake the crust for 12-15 minutes, or until lightly golden.
- In a saucepan, whisk together the softened butter, sugar, eggs, lemon juice, and lemon zest.
- Cook over medium heat, stirring constantly, until the mixture thickens enough to coat the back of a spoon (about 5-7 minutes).
- Pour the warm lemon filling over the pre-baked crust.
- Crumble the remaining shortbread dough over the lemon filling.
- Bake for an additional 18-20 minutes, or until the topping is golden brown and the filling is set (it should still have a slight jiggle).
- Let the cake cool completely in the pan before releasing it from the springform pan.
- Dust with powdered sugar before serving.