How to cook
Mix everything with the sifted flour with baking powder and add the vanilla. Put the batter into a greased and floured form. Bake in a moderate oven, checking its readiness with a stick.
Make a sugar syrup from the dissolved sugar, lemon juice, 3 1/3 tbsp (50 ml) of water and rum flavoring and pour it over the ready sponge cake. If desired, sprinkle it with powdered sugar.