Mix eggs, oil and 250 g yoghurt. Stir in semolina, 250 g sugar, flour, baking powder and salt. Place on a greased fat pan of the oven (32 x 39 cm) and smooth down. Bake in the preheated oven (electric cooker: 175 °C/ circulating air: 150 °C/ gas: level 2) for 30-40 minutes until brown (stick test!)
Roast the grated coconut in a pan without fat until golden brown, remove. Peel grapefruits, except for 1, so that the white skin is completely removed. Remove the fillets with a sharp knife between the parting skins. Squeeze the juice out of the parting skins. Cut 1 grapefruit in half, squeeze the juice as well
Measure out 200 ml of juice. Simmer juice and 150 g sugar in a pot until the sugar is dissolved. Take the cake out of the oven, soak it bit by bit with about 2/3 of the still hot syrup. Let the cake cool down
Mix 400 g yoghurt and 75 ml water. Add cream powder all at once. Whisk with the whisk of the hand mixer for approx. 1/2 minute at lowest setting, then whip at highest setting for approx. 3 minutes. Whip cream until stiff, fold in
Cut the cake into pieces on the tray. Spread the cream on the pieces. Cover with grapefruit fillets and sprinkle with coconut flakes. Sprinkle with remaining syrup before serving
Waiting time approx. 1 hour