Attributed to various French and Italian traditions; 'torta caprese' (Capri chocolate-almond cake) is a regional Italian antecedent; flourless versions popularised in French pâtisserie c. 20th century.
The flourless chocolate cake is one of those preparations where the absence of an ingredient produces a better result than its presence. Without flour to structure and dilute, the chocolate takes centre stage completely — the result is dense, fudgy, intensely flavoured, and silky in a way that flour-based chocolate cake can never achieve. The preparation is simple: chocolate and butter melted together, eggs and sugar beaten until pale and thick, the two combined and baked until just set. The key is understanding 'just set': the cake should still wobble slightly in the centre when pulled from the oven; it will firm to perfection as it cools. The crust that forms on the exterior — slightly crackled, delicate, almost meringue-like — contrasts with the molten interior. This cake is naturally gluten-free, requiring no adaptation, and it is also the reference point against which all other chocolate desserts should be measured.
Use the best chocolate you can afford — there is nowhere for inferior chocolate to hide; 70% minimum cocoa solids Temper the chocolate-butter mixture before adding eggs — it must cool to body temperature before the eggs go in or they scramble Beat eggs and sugar to the ribbon stage — the mixture should fall from the whisk in a thick, pale ribbon; this incorporates air essential for lift Bake in a bain-marie — gentle, even heat prevents the exterior from setting before the interior cooks Underbake deliberately — a centre that wobbles is correct; it sets to the right texture as it cools Chill before slicing — a warm flourless cake is too soft to slice cleanly
A pinch of espresso powder enhances chocolate flavour without adding coffee taste — it works as a flavour amplifier Fleur de sel scattered on top just before baking creates a sweet-salty counterpoint that is transformative For an even richer result: substitute some of the butter with crème fraîche — the slight acidity brightens the chocolate and adds complexity
Adding hot chocolate to eggs — scrambled eggs produce a grainy, broken cake Overbaking — a fully set centre in the oven becomes rubbery once cooled; the wobble is the target Using low-quality chocolate — the entire flavour profile depends on the chocolate; invest here Skipping the bain-marie — direct oven heat produces uneven cooking and a tough exterior Slicing while warm — the cake needs to be cold and firm; cut with a hot, dry knife