Grease the springform pan (26 cm Ø). Separate eggs. Mix fat and 60 g sugar until creamy. Stir in the egg yolks one by one. Mix flour and baking powder and stir in briefly, alternating with the milk
Beat the egg white and salt until stiff, adding 75 g sugar. Keep beating until the sugar is completely dissolved
Spread the sponge mixture into the mould. Spread the beaten egg white on top. Bake in the preheated oven (electric cooker: 175 °C/circulating air: 150 °C/gas: level 2) for 25-30 minutes. Cool down. Remove from the mould
Close the cake ring around the base. Put only 200 ml of water into a mixing bowl. Add all the cream powder at once, stir briefly with the hand mixer on the lowest setting. Then beat for 3 minutes at highest setting until frothy. Stir in 500 g yoghurt (more than indicated on the package) briefly. Spread on the bottom. Chill for approx. 3 hours
Wash, clean, pat dry and halve the strawberries. Cover the cake with them. Warm the jelly and spread it on the strawberries. Chill for about 15 minutes. Decorate with icing sugar etc.