Almond Cake

Marzipan itself is the ingredient to get right, and it's not a luxury you can shrug past. Good marzipan is mostly ground almonds with sugar worked in — the almond content should be high enough that it still tastes of almonds, not just sugar with a memory of them. Cheap marzipan, heavy on sugar and light on almond, won't fail outright but the cake comes out sweeter and flatter, because almond's job here is fat and flavour, and sugar can't do either. If you can't get marzipan, you're not really substituting it — you'd be making a different cake, so don't try to fake it with ground almonds and icing sugar stirred together; the fineness of commercial marzipan, worked through a mill, is what lets it blend smooth rather than grainy.

Butter at room temperature means soft enough to dent with a finger, not soft enough to pool. Cold butter won't blend into the marzipan-sugar paste; it'll sit in lumps and melt unevenly in the oven, leaving pockets of grease. Butter that's gone soupy-warm won't hold the air you're beating into it, and the cake loses the lift it depends on, since there's so little flour to give it structure any other way. Any dairy butter at the right softness does this job — there's no substitute here that behaves the same, because you need both fat and the water-in-fat emulsion butter carries.

The eggs are doing double duty: moisture and the protein that sets around 60-70°C to hold the crumb together once the flour's modest contribution runs out. Room-temperature eggs blend in without shocking the butter-fat mixture cold; eggs straight from the fridge make the batter seize briefly, which is exactly when people panic and think they've "split" it for good. They haven't — keep beating gently and it recovers, but it's slower and less pretty.

Flour here isn't for texture, it's a safety net — just enough gluten to stop the cake collapsing once it cools, without making it bready. This is why you fold it in last and briefly: overwork it now and you build gluten you don't want, and the cake turns tough instead of dense-but-tender, which is the whole point of this style.

For the glaze, the dark chocolate wants to be properly dark — low in milk solids, high in cocoa — because its bitterness is doing the job of balancing all that sugar in the marzipan and icing sugar glaze. Melt it over a bain-marie, meaning the bowl sits above simmering water, not in it: chocolate seizes and turns grainy if water gets into it or if it overheats, because the sugar crystals in it clump the moment they're exposed to stray liquid at the wrong temperature. The milk, stirred in once the chocolate's off the heat, loosens it to a spreadable glaze rather than a hard shell — add it too soon over heat and you risk exactly that seizing.

Hazelnuts get toasted dry, no oil, because you're not frying them — you're driving off moisture and loosening the skin, which is bitter and papery and worth losing. The skins start to lift because the nut's natural oils finally reach the surface and the dry heat has shrunk the skin against the kernel underneath; that's your visual cue, not a clock. Wrapping them in a cloth while warm and rubbing is just friction doing in thirty seconds what patience under a tea towel always has — no fancy trick, just heat loosening and cloth scrubbing it off. If you're out of hazelnuts, use any nut with a comparable fat content and a roastable skin — almonds in their skins, for instance — but you're changing the cake's character a little when you do.