Grease a square springform pan (24 x 24 cm) and dust with flour. Mix flour, 25 g cocoa and baking powder. Beat the eggs, 1 pinch of salt and brown sugar with the whisk of the hand mixer until thick and creamy.
Stir in oil and buttermilk. Sift the flour mixture on top and stir in briefly. fill the dough into the prepared form and smooth it down. Bake in a preheated oven (electric cooker: 175 °C/ circulating air: 150 °C/ gas: see
manufacturer) bake for about 12 minutes. Remove and let cool on a cake rack.
Chop the chocolate for the caramel cream. Bring 150 g sugar and 5 tbsp water to the boil in a pan. Caramelise until golden brown. Add 150 g cream and bring to the boil. Add chocolate and simmer while stirring until caramel and chocolate have melted.
Remove from the heat and let it cool down lukewarm. Remove the cake from the mould. Place the ring around the base again.
Beat the egg whites over a warm water bath with the whisks of the hand mixer until stiff. Add 1 pinch of salt and 100 g sugar. Beat until the mixture is shiny and the sugar has dissolved.
Spread meringue on the floor. Spread the caramel mass on top. Whip 250 g cream with the whisk of the hand mixer until stiff. Spread carefully on the caramel mass. Chill for about 30 minutes.
Remove from the mould and serve dusted with 1 tablespoon of cocoa. Cut into pieces and decorate with strawberries.