The French Christmas cake shaped to look like a log. A thin génoise sponge is baked in a shallow tray, spread with buttercream and rolled into a cylinder, then coated on the outside with more buttercream that is forked or piped into bark-like ridges. It is decorated to resemble a cut log — often with meringue mushrooms, a dusting of icing sugar for snow and sometimes a sawn-off branch end — and served as the dessert of the réveillon, the French Christmas Eve meal.
The cake-form bûche de Noël evolved in the 19th century as a confectioner's reimagining of an older European custom: the burning of a large Yule log in the hearth at Christmas, which faded as open fireplaces gave way to stoves. Its exact origin is disputed and the sources contradict one another — variously crediting an apprentice in Saint-Germain-des-Prés around 1834, the Lyon chocolatier Félix Bonnat in the 1860s, and the pastry chef Pierre Lacam around 1898 — so no single inventor can be confirmed. What is clearer is that the dessert only became a widespread French Christmas standard after the Liberation, in the years around 1945 to 1950.
Soft, springy sponge spirals around layers of rich, smooth buttercream, the whole thing cool, dense and very sweet — a slice cut crosswise shows the swirl like tree rings. A good bûche is moist and tender, the sponge rolled without cracking and the buttercream silky rather than grainy; a dry, cracked sponge or split, broken buttercream marks a poor one. It is served chilled but is best eaten a little below cold so the buttercream is creamy, not hard.
Two techniques carry the cake. The génoise is a foam sponge: whole eggs and sugar are whisked over gentle heat until they trap air and triple in volume, and flour is folded in so the batter bakes into a thin, flexible sheet that can be rolled warm without snapping the crumb. The coating is buttercream, an emulsion of butter beaten into a base — meringue or a cooked egg-and-sugar syrup — so fat and water hold together as a smooth, pipeable cream stiff enough to be textured into bark. Rolling the warm sponge around the filling and setting it cold fixes the spiral.
Variations
The fillings and coatings vary widely: classic chocolate buttercream, coffee, praline, chestnut cream, or fruit; the sponge may be flavoured or brushed with syrup. Modern pâtisserie bûches abandon the rolled sponge entirely for a moulded log-shaped entremets — layered mousse and crémeux over a sponge or biscuit base, glazed and frozen — sold each December by French pastry houses. The decoration almost always keeps the woodland theme: meringue mushrooms, marzipan holly and icing-sugar snow.
On the Palate
Where Bûche de Noël sits in the French flavor cloud
Ingredients
Serves 10How it's made
7 steps · 1 hour
- 115 min
Whisk whole eggs with sugar over gentle heat until pale, thick and tripled in volume, then fold in the sifted flour.
Watch outWhisk the eggs and sugar over gentle heat until pale, thick and tripled in volume — that trapped air is the sponge's only lift; underwhipped, it bakes flat and cracks when rolled.
- 210 min
Spread the batter thinly in a lined shallow tray and bake at 200°C until just springy, about 8 to 10 minutes.
- 320 min
Turn the hot sponge out onto a sugared cloth, peel off the paper and roll it up in the cloth while warm; leave to cool rolled.
Watch outRoll the sponge up in the sugared cloth while it's still warm — a cooled sheet has set stiff and cracks the moment you try to curl it.
- 420 min
Make the buttercream: beat softened butter into a meringue or cooled egg-sugar base until smooth, and flavour it (chocolate, coffee or chestnut).
- 58 min
Unroll the cooled sponge, spread with a layer of buttercream and roll it up again without the cloth.
- 612 min
Coat the outside with the remaining buttercream and draw a fork along it to make bark-like ridges; chill until firm.
- 710 min
Decorate with meringue mushrooms and a dusting of icing sugar, and keep refrigerated until serving.
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