Whip butter, sugar and vanilla sugar until creamy. Stir in the eggs one by one. Mix flour, semolina and baking powder. Alternately stir in with the milk.
Pour approx. 1/3 of the dough into a greased and flour and almond coated ring cake mould (approx. 2.5 litres capacity). Spread the jam on top, leaving some space around the edge of the mould. Add the remaining dough and smooth it down.
Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 50 minutes. Take the ring cake out of the oven and let it rest for about 10 minutes. Turn the cake onto a cake rack and let it cool down.
Dust with icing sugar. If necessary, decorate with jam and cut into pieces.