A German tray cake built from a two-tone pound batter — half plain, half darkened with cocoa — spread in layers and strewn with sour Morello cherries. As it bakes the cherries sink through the dark batter into the pale one, dragging the colours into a wavy seam that gives the cake its name. The cooled sheet is spread with a thick custard buttercream and finished with a chocolate glaze that is combed into ridges with a fork to echo the same waves on top. Cut into squares, it is a fixture of the German Kaffeetafel; in Austria and the former East it is just as often called Schneewittchenkuchen, after Snow White, for its black, white and red.
Donauwelle is a creature of the modern German home-baking era rather than an old regional speciality, and its precise origin is not documented. The name nods to the Danube — most plausibly to the cake's popularity in the lands the river runs through — but the reason it was tied to that river in particular is unclear, and reference works record no firm inventor or date. It became a coffee-table standard across Germany and Austria through the 1950s and 1960s, a spread that owed much to packaged cake mixes and convenience products sold under names like Donauwelle and, in its Snow White guise, Schneewittchenkuchen. Stories tracing it to 18th-century Danube-Swabian settlers circulate in popular writing but are not securely established.
A square slice shows three clear bands: a pale-and-dark marbled cake streaked with sunken cherries at the base, a thick pad of pale custard buttercream in the middle, and a thin lid of dark chocolate combed into ridges. It eats soft and cool — the buttercream is smooth and only lightly sweet, the cake tender and buttery, and the sour cherries cut through both with little bursts of tartness. The chocolate snaps thinly under the fork before giving way to the cream. Best eaten cold from the fridge, when the layers stay distinct.
The wave is pure physics, not piping. Both batters are a classic pound-cake mix — roughly equal weights of butter, sugar, egg and flour — so they bake up dense and stable; the pale layer goes down first, the cocoa layer on top, and the cherries are scattered over the surface. Their weight carries them down through the looser hot batter, and as they sink they pull the dark cocoa layer down in tongues into the pale one, setting that marbled seam permanently as the cake bakes. The filling is German buttercream, a cooked milk-and-egg custard whipped into softened butter, which is firmer and less sugary than icing-sugar buttercream and holds a clean layer. The chocolate top is glazed while just fluid, then dragged with a fork or cake comb so the ridges set hard.
Variations
The everyday version skips the wave-combing and simply pours the chocolate flat, or scatters chopped nuts over the glaze. Some bakers lighten the buttercream by folding in whipped cream or using a vanilla pudding base; others brush the sponge with a little cherry juice or Kirsch for extra moisture and tartness. The Austrian and East German Schneewittchenkuchen is essentially the same cake under a different name, played up for its Snow-White black-white-red colour scheme. Tinned or jarred sour cherries are standard year-round, with fresh Morellos used in season.
On the Palate
Where Donauwelle sits in the German flavor cloud
Ingredients
Serves 16
How it's made
8 steps · 1 hour active + 1 hour 30 min waiting
- 115 min
Cream softened butter with sugar until pale, then beat in the eggs one at a time and fold in flour and baking powder to a smooth pound batter.
- 25 min
Divide the batter in two; leave one half plain and stir cocoa and a splash of milk into the other.
- 35 min
Spread the plain batter evenly over a lined baking tray, then spread the cocoa batter on top.
- 45 min
Drain the sour cherries well and scatter them evenly over the surface.
Watch outScatter the well-drained cherries evenly over the cocoa layer — their weight sinks them down and pulls the dark batter into the pale one, drawing the waves for you.
- 530 min
Bake at 180°C until set and golden, about 25-30 minutes; the cherries will sink and draw the waves. Cool completely.
- 625 min
Cook milk, sugar, egg yolks and cornflour into a thick custard, cool to room temperature, then whip into softened butter to a smooth buttercream.
- 715 min
Spread the buttercream in an even thick layer over the cooled cake and chill until firm.
- 815 min
Melt chocolate with a little oil, pour over the buttercream, and just before it sets drag a fork across the surface in waves; chill, then cut into squares.
Watch outWait until the chocolate glaze is almost set, then drag a fork through it in waves — too runny and the lines close up; too firm and it cracks.
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