Drain mandarin oranges well in a sieve. Beat the eggs in a very large mixing bowl with the whisk of the hand mixer until thick and creamy (approx. 12 minutes). Add sugar, vanillin sugar and salt. Add butter-vanilla flavouring, quark, mascarpone, cream and 50 g almonds, stir well. Sift the pudding powder on top and stir in well. Carefully fold in about 280 g of the mandarin oranges. Pour the quark mixture into a well greased oven pan sprinkled with 25 g almonds, smooth it down.
Spread the rest of the mandarin oranges and almond flakes on top. Bake in the preheated oven (electric oven: 175 °C/ gas: level 2) for 50-60 minutes. Remove from the oven, place on a rack and let cool off well. The cake can be prepared the day before. When well cooled, it is best cut. Makes about 24 pieces