For the dough
3/4 cup unsalted butter, softened and cut into small pieces
2 cups rolled oats
3/4 cup all-purpose flour
3/4 cup sugar
1 egg
For the filling
4 large egg yolks
3/4 cup sugar
1/2 cup all-purpose flour
1/2 teaspoon baking powder
1/4 cup unsalted butter, melted
3/4 cup milk
1/2 teaspoon grated lemon zest
For the dough
3/4 cup unsalted butter, softened and cut into small pieces
2 cups rolled oats
3/4 cup all-purpose flour
3/4 cup sugar
1 egg
For the filling
4 large egg yolks
3/4 cup sugar
1/2 cup all-purpose flour
1/2 teaspoon baking powder
1/4 cup unsalted butter, melted
3/4 cup milk
1/2 teaspoon grated lemon zest
In a food processor, combine all the dough ingredients and process rapidly until the mixture forms a ball (do not overprocess)
Place it on a floured surface and knead slightly, incorporating a little more flour to obtain an uniform mass
Roll out 1/3 of the dough onto the bottom of a 29 cm diameter cake pan, greased with butter
With the remaining dough, cover the sides of the cake pan, leaving a height of 2.5 cm
Bake in a preheated medium oven (180°C) for 15 minutes or until the surface of the dough is dry
Remove from the oven and let it cool. Reserve
While that cools, prepare the filling: In a stand mixer, combine egg whites and beat until stiff peaks form
Add sugar and continue beating until firm peaks form
Add yolks and beat well
Add flour and baking powder, alternating with melted butter
Mix
Add milk and lemon zest
Mix again with a spatula
Place this mixture over the pre-baked dough and bake for 30 minutes or until it becomes firm and lightly golden
Remove from the oven, let it cool, and then unmold
This cake is perfect to accompany tea or coffee in the afternoon
Serves 10 pieces
Calories per serving: 400
Obs.: If you don't have a food processor, make the dough the traditional way with manual kneading.