Cream fat, sugar, vanillin sugar and salt with the whisk of the hand mixer. Stir in the eggs one after the other. Mix flour, cocoa and baking powder. Alternately stir in the flour mix and red fruit jelly
Place the mixture in a greased box form (approx. 7.5 cm high, 8.5 cm wide, 28 cm long; approx. 1.75 litres capacity) and bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for 55-60 minutes (stick test). Take out the cake, remove from the edge and let it cool down in the mould on a cake rack