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:

  1. 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.
  2. Flatten the dough into a disc, wrap in plastic wrap, and chill for at least 30 minutes.
  3. Preheat oven to 350°F (175°C).
  4. Press half the dough evenly into the bottom of the springform pan. Reserve the remaining dough.
  5. Bake the crust for 12-15 minutes, or until lightly golden.
  6. In a saucepan, whisk together the softened butter, sugar, eggs, lemon juice, and lemon zest.
  7. Cook over medium heat, stirring constantly, until the mixture thickens enough to coat the back of a spoon (about 5-7 minutes).
  8. Pour the warm lemon filling over the pre-baked crust.
  9. Crumble the remaining shortbread dough over the lemon filling.
  10. 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).
  11. Let the cake cool completely in the pan before releasing it from the springform pan.
  12. Dust with powdered sugar before serving.