Rhubarb Crumble Cake with Buttery Streusel

Tart rhubarb, golden butter crumbs and a soft yeast base: rhubarb crumble cake has a little of everything in each slice. The fruit stays pleasantly tangy beneath the sweet topping. Pick a piece with plenty of streusel and pour the coffee.

Start with the yeast dough

Set aside the flour, butter and sugar needed for the streusel, plus some sugar for the rhubarb. Prepare the yeast according to its package. Gently warm the milk until lukewarm, not hot, then combine it with the yeast and the dough portions of flour and sugar. Add the eggs, vanilla sugar, salt and softened dough butter. Knead until smooth and elastic, cover and let the dough rise until noticeably airy.

Prepare the stalks and butter crumbs

Wash the rhubarb, discard all leaves and trim the ends. Only the stalks go into the cake. Pull coarse strings from thicker stalks and cut them into even pieces. Pat dry and mix with the reserved fruit sugar just before topping the dough.

Rub the reserved streusel flour, butter and sugar together until loose crumbs form. Stop before they become a smooth paste. Chill the crumbs if the butter softens enough to make them greasy.

Layer, let rise and bake

Line the baking pan with parchment and spread the risen dough evenly across it. If it shrinks back, let it relax briefly under a cover before continuing. Scatter the rhubarb evenly over the base, then add the streusel. Let the topped dough rise again until puffy.

Preheat the oven following the illustrated baking guidance. Bake until the rhubarb is tender and the topping is golden. Test the cake layer near the center, beside a piece of fruit: juice may dampen the tester, but sticky, raw dough means the base needs more baking. Do not taste raw dough or streusel; flour and eggs can carry germs. Clean hands, utensils and surfaces afterward.

Let the layers settle before slicing

Give the cake time to firm up in its pan, then lift each portion with a cake server. Serve slightly warm or cooled with espresso doppio. Its concentrated flavor complements the sweet butter topping.

Frequently asked questions

Does every rhubarb stalk need peeling?
Tender, thin stalks usually do not. Strip away tough outer fibers from thicker stalks so they are easier to eat.

Why is the cake base dense?
The enriched dough needs to rise before shaping and again after topping. A heavy layer of fruit in the center can also make the base harder to bake evenly.

How should I store the leftovers?
Let the cake release its heat, then cover and refrigerate it promptly. Avoid sealing it while steaming, which makes the streusel wet.