Rub the zest of 2 limes and squeeze approx. 125 ml of juice from all the limes.
Beat butter and 250 g sugar with a hand mixer for about 8 minutes until creamy. Gradually stir in the eggs. Sift the flour, cornstarch and baking powder into the mixture and fold in half of it.
Briefly stir in the milk and lime zest, 75 ml lime juice and the rest of the flour.
Pour the batter into a greased ring cake tin.
Bake in a preheated oven at 200 ° C for approx. 45 minutes.
Put 50 g sugar, 2 tablespoons water and 30 ml lime juice in a saucepan and bring to the boil. Prick the cake several times with a skewer and drizzle with this lime syrup. Heat the jam and spread it on the warm cake.
Mix 20 ml lime juice with powdered sugar and brush the cake with it.