1 cup sugar
3 cup flour
1/4 tsp salt
1 tsp baking powder (or 0.5 tsp baking soda)
1/4 lb (125 g) butter or margarine
1 tsp vanilla sugar
1 cup sour jam
Whip eggs; add sugar and vanilla by teaspoon continuing whipping.
When this mix starts to clump, add melted butter or margarine, continuing stirring.
Divide the dough into 2 parts: 2/3 and 1/3.
Cover a baking sheet with baking paper, put 2/3 of the dough on this sheet, and spread the dough flatly by over it.
Spread jam over the dough.
Grate and rub the leftover 1/3 of dough over the baking sheet to cover the jam entirelly with a layer of dough shreds.
Place the pie in an oven pre-heated to 400 F (200 C), and bake for about 20 minutes.