Place 1 paper cups in the recesses of each muffin tray (for 12 pieces). Separate 3 eggs. Cream the fat, 125 g sugar, vanillin sugar, lemon zest and 1 pinch of salt. Stir in 3 egg yolks and 1 egg separately. Mix flour and baking powder and stir in alternately with 3 tbsp. lemon juice briefly. Pour into the moulds. Bake in the preheated oven (electric cooker: 175 °C/circulating air: 150 °C/gas: level 2) for approx. 20 minutes
Beat 3 egg whites, 1-2 tsp. lemon juice and 1 pinch of salt until stiff. Add 125 g sugar and continue beating until the sugar is completely dissolved. Spread on the muffins. Bake at the same temperature for about 10 minutes. Let them cool down
Defrost the berries. Bring half the berries, 100 ml water and 2-3 tbsp sugar to the boil. Fold in remaining berries. Let cool down if necessary. Dust muffins with icing sugar. Add sauce