Preheat oven (electric cooker: 175°C/ circulating air: 150°C/gas: see manufacturer). Grease the mould with butter and dust with flour
For the sponge mixture, sieve 350 g flour into a bowl and mix with baking powder. Add 200 g butter, sugar, eggs, milk and orange peel. Using the whisks of the mixer, mix to a smooth dough, first on a small and then on the highest setting. Fill into the form, smooth it down. Bake the cake on the bottom shelf in a hot oven for 50-60 minutes. Approx. 10 minutes before the end of the baking time, check with a long wooden stick whether the cake is ready. If there is still soft dough sticking to the spit, bake for another 5-10 minutes
For the syrup squeeze oranges and lemon. Heat up the juices in a pot and dissolve the powder in it. Prick the finished cake several times and sprinkle with syrup. Let it cool down
Falling onto a cake rack. Soak the whole cake with syrup again. Let it cool down
Waiting time approx. 1 hour