Drain the cherries well on a sieve. Cream fat, sugar and vanilla sugar. Add egg and lemon peel and stir in. Sift flour and baking powder and stir half into the fat-sugar mixture.
Knead in the remaining flour with your hands and work into crumbles. Press 2/3 of the crumbles into a greased pie mould (26 cm Ø), pressing the rim up. Pre-bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 15 minutes.
Mix the cherries and jam and put it on the cake. Spread crumbles on top and bake in the oven at the same temperature for another 20-25 minutes. Let the cake cool down and serve. Decorate with mint.