Grind the poppy seeds and add to 100 ml of boiling milk. Leave to swell for about 10 minutes over a low heat. In the meantime, stir the fat and sugar until frothy, then add the eggs one after the other. Add salt and lemon zest. Mix flour, starch and baking powder. Alternately stir in the remaining milk. Divide the dough into three.
Pour 2/3 of the dough into a greased, breadcrumbed ring cake tin (approx. 2 1/2 l capacity). Mix the remaining dough and poppy seed mixture, pour onto the light-coloured dough. Bake in a preheated oven (electric range: 175 °C/ gas: level 2) for approx. 50 minutes, allow to cool slightly, turn out of the mould and allow to cool completely. Stir icing sugar and lemon juice until smooth, pour over the cake and allow to set. Results in about 20 pieces. Serve with whipped vanilla cream. Makes about 20 pieces.