Ingredients:

Flour, 200 gr.
Sugar, 100 gr.
Butter, 100 gr.
Eggs, 2
Lemon
Salt

Mix sugar and butter, then add the egg yolks, flour, a pinch of salt and a table spoon of lemon juice.
Form a ball of dough and let it rest for about 30 minutes.
On a round baking pan spread a little more than half the dough, cover it with marmalade, jam, nutella or with your favorite filling.
Use the rest of the dough to cover the filling : make stripes of dough and form a grid. Brush the stipes with the egg whites.
Bake in the oven for about 35 minutes at 350 F.