Step 1

In a bowl, cut the cold butter into thin slices and add the flour, sugar, grated lemon rind, baking powder, yoghurt and egg yolks, knead a smooth dough.

Step 2

Divide the dough into 2 equal parts, wrap them separately in plastic wrap and put them in the fridge for 2 hours.

Step 3

In the meantime, make the filling. Start by cutting the peeled apples into thin slices.

Step 4

Put them in a pot, pour on the lemon juice, add the sugar, vanilla and stir carefully. Put the pot on the stove and saute the filling on low heat for about 5 min.

Step 5

Take the pot off the heat, add the raisins and cinnamon and stir carefully.

Step 6

Heat the oven to 360°F (180 °C). Lay out a rectangular oven dish with baking paper, lay out 1 part of the dough in it like a sheet, put the oven dish in the oven and bake 10 min. until semi-cooked.

Step 7

Smear it with the jam and sprinkle with 1/2 the walnuts. On top, distribute the cooled apple filling evenly and sprinkle the remaining walnuts on.

Step 8

Using a grater, grate the other dough part evenly on top. Put the oven dish in the oven again and finish baking for about another 40 min.

Step 9

Take the baked cake out, put it with the baking paper on a cooking grid to cool fully. Cut it into squares and sprinkle generously with powdered sugar.