Donauwelle
Donauwelle, the 'Danube wave', is a German home-baker's favourite from the 1970s onwards, made on a tray for school fairs, birthdays and the Sunday coffee table. Cut a slice and you see the river: vanilla and chocolate sponge swirled into waves by sour cherries pushed into the batter, then a thick layer of vanilla buttercream and a dark chocolate top combed into ripples. A common mistake is pouring on the chocolate while the buttercream is soft, which melts the layers together; chill the cake well first. Chef's tip: warm a serrated knife in hot water and wipe it between every cut so the chocolate cracks cleanly instead of shattering.
























