Ingredients
Pan sizes, times and temperatures in the method are not scaled.
Dough
Fillings
Glaze
Method
Mix the eggs (4), granulated sugar (200 g1 cup), sour cream (200 g¾ cup + 2 tbsp), butter (200 g¾ cup + 2 tbsp) and vanilla (1 tsp). Add the flour (500 g4¼ cups) and baking powder (10 g2½ tsp) gradually. Divide the dough into 4 equal pieces.
Heat the oven to 340°F (170°C). Roll each piece into a sheet to fit your pan and bake each 12 to 15 minutes.
Layer: a sheet, the plum jam (200 g), a sheet, the apricot jam (200 g), a sheet, the sour cherry or strawberry jam (200 g), and the last sheet.
Glaze. Whisk the egg yolks (3), granulated sugar (100 g½ cup) and lemon juice in a bowl over simmering water until thick. Spread over the top.
Refrigerate with a weight on top for 24 hours. Cut into squares.