Knead 200 g flour, 150 g fat in flakes, 100 g sugar, 1 packet vanilla sugar, 1 pinch of salt and orange zest into crumbles. Set aside. Clean, wash and cut the rhubarb into pieces and drain well in a sieve.
Mix cream cheese with icing sugar and 1 sachet of vanillin sugar. Dice the marzipan. Mix 225 g fat, 125 g sugar, 1 packet vanillin sugar, 1 pinch of salt and marzipan with the whisk of the hand mixer until creamy.
Stir in the eggs one by one. Mix 375 g flour and baking powder and stir in alternately with the milk. Put the dough on a well greased fat pan and smooth it down. Put cream cheese in patches on the dough.
Spread rhubarb evenly on the cake. Sprinkle with crumbles. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 45 minutes. Let the cake cool down on a grid, cut it into 24 pieces and arrange on a plate.