Line a baking sheet with parchment paper and place the puff pastry on top of each other.
Preheat the oven (electric stove: 200 ° C, gas mark 3).
Liquefy the margarine in a saucepan. Mix in the flour, sugar, vanilla sugar, a pinch of salt and the almonds with a fork. Now crumble the dough evenly over the puff pastry as a crumble. Bake the cake for 30 minutes.
Heat the jam in a saucepan and brush over the hot cake. Make icing from powdered sugar, lemon juice and water and drizzle it on the cake.
Tip: The cake tastes best when it sits through at least one night.