Defrost berries and preheat oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer). Grease a springform pan (26 cm Ø). Cream 200 g butter and sugar with the whisks of the mixer.
Stir in the eggs one by one. Mix flour and baking powder. Alternately stir 100 ml lemonade into the butter-sugar-cream. Fold in almonds.
Put the dough into the mould and smooth it down. Spread the berries on top. Bake in a hot oven for about 45 minutes. Take out, carefully remove the cake from the edge and let it cool down.
For the icing, mix icing sugar and 2 tablespoons lemonade. Dribble over the cake and allow to set.