Wash, clean and halve the strawberries. Peel bananas, cut 2 bananas into small pieces, slice 1 banana and sprinkle with lemon juice. Mix the banana pieces with 250 g sugar with the whisk of the hand mixer. Mix flour and baking powder. Stir eggs, milk and oil into the banana mixture. Stir in flour mixture
Line a large box form (11.5 x 32 cm) with baking paper and spread the dough evenly in it. Spread strawberries and banana slices on top. Bake the cake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 65 minutes
Caramelize 3 tablespoons of sugar and 1 tablespoon of water, stir in macadamia nuts. Spread on a piece of baking paper and let it cool down. Whip the sour cream and icing sugar for about 3 minutes. Chop the macadamia nuts, stir in and add