Drain the mandarins. Grease a fat pan (approx. 32 x 39 cm; at least 3.5 cm deep) and dust with flour. Cream butter, 100 g sugar, vanillin sugar, 1 pinch of salt and half lemon zest. Stir in 3 eggs individually. Mix flour and baking powder, stir in briefly. Spread on the fat pan. Place mandarins on top
3
Beat 2 egg whites and lemon juice until stiff. While continuing to beat, pour 75 g sugar into the mixture. Keep beating until the sugar is completely dissolved. Spread as a blob on the cheese mixture. Continue baking for about 15 minutes. Cool down