Separate eggs. Beat the egg whites and 4 tbsp. cold water until stiff, add 125 g sugar. Beat the egg yolks and lemon zest into the mixture. Mix flour, starch and baking powder, fold in
Spread the mixture on a baking tray lined with baking paper (approx. 32 x 37 cm). Bake in the preheated oven (electric cooker: 200 °C / convection oven: 175 °C / gas: level 3) for approx. 12 minutes. Turn onto a tea towel sprinkled with 2 tbsp. sugar, remove paper. Let the sponge cake cool down
Wash, clean and halve the strawberries. Whip the mascarpone, sour cream, vanillin sugar and 50 g sugar with the whisk of the hand mixer for approx. 4 minutes, allowing the cream to trickle in
Shorten the long side of the sponge cake plate by a strip about 12 cm wide. Crumble the strip. Place the strawberries close together on the base. Spread mascarpone cream on top. Sprinkle with crumbs. Chill for 5-6 hours or overnight
Roast the almonds. Cut the cake into about 15 pieces. Sprinkle with almonds and dust with icing sugar