Clean, wash and cut the rhubarb into small pieces. For the crumbles, mix 125 grams of flour and 75 grams of sugar. Melt 75 grams of fat, add and knead into crumbles. For the sponge cake dice marzipan. Beat with remaining fat and sugar until foamy. Stir in eggs one by one. Mix remaining flour, baking powder, grated lemon peel and melting flakes.
Alternately stir in with the milk. Fill the dough into a springform pan (24 cm Ø) lined with baking paper. Spread rhubarb on top. Sprinkle with crumbles and bake in a preheated oven (electric: 175 °C/ gas: level 2) for about 1 1/4 hours. Let cool and serve dusted with icing sugar. Results in twelve pieces