Panna Cotta with Orange and Liquorice

Start with the 90°C heating of the cream — that number matters more than it looks. Gelatine needs enough heat to actually dissolve and disperse evenly through the liquid, but if you let it boil, two things go wrong: you start denaturing the gelatine's own setting power, and you cook off moisture so your proportions drift and the set turns too firm or patchy. You don't need a thermometer glued to the pan for this — you're looking for the surface just starting to shiver and release a thin wisp of steam, well before any bubble breaks. Some say you can skip this and just warm everything to "hot" — no, because gelatine bloomed in cold water and then dropped into liquid that's merely warm won't fully unfold and dissolve, and you'll get stringy, uneven lumps sitting in your cream instead of an invisible set.

The vanilla pod split and scraped onto a chopping board, with sugar crushed into the seeds — that's not fussiness, that's because vanilla seeds are tiny and oily and want to clump. The sugar acts as an abrasive, breaking the seeds apart so they distribute through the cream as flecks instead of a single sticky knot sitting at the bottom of the pan. If you've only got vanilla extract, a teaspoon stirred in off the heat does the job — you lose the visual flecking, nothing else.

Gelatine leaves bloomed in cold water first, always — this is the step people skip when they're in a hurry, and it's the one that causes the most failures downstream. Cold water lets the leaves absorb liquid slowly and evenly; drop dry gelatine straight into hot cream and the outside of each leaf seizes into a skin before the inside ever hydrates, so you get gelatine that never fully integrates. If leaves aren't on your shelf, powdered gelatine works the same principle — bloom it in a few spoons of cold water until it looks like wet sand, then melt it into the hot liquid the same way. The quantities aren't interchangeable gram-for-gram, so check the packet rather than guessing.

The one-and-a-half hour cool on the counter before chilling isn't there to be fussy about timing — it stops condensation forming a skin or watery layer on top when hot cream goes straight into a cold fridge, and it lets the mixture thicken slightly so it doesn't slosh when you move the glasses. Then the long chill — two to three hours, not a number to shortcut — is where the actual setting happens; gelatine needs sustained cold to lock its protein network, and an hour in a busy fridge that's constantly opened and closed for milk and Sunday roast leftovers isn't the same hour as an undisturbed one. Check it by nudging a glass gently: it should hold a dome, not run flat, before you risk the orange layer on top.

Pouring the jelly only after the panna cotta has properly set — that's the one rule in this whole dish you cannot cheat. Warm liquid jelly poured onto a soft-set cream will simply sink in and marble together, and you lose the clean two-layer look that's the entire point of the dish. The liquorice root powder is a bitter, aromatic finish rather than a flavour you build a sauce from — a pinch goes a long way, so resist the urge to be generous; if you can't get it, a little very finely grated dark chocolate or even a whisper of fennel pollen gives a related savoury-bitter note, though neither is really liquorice.

The white chocolate mousse is the forgiving part, and also where the bain-marie discipline matters most. Turning the heat off the moment the chocolate meets the hot water, and pulling the bowl before it's fully melted, is about chocolate's low scorch point — white chocolate, with its milk solids and no cocoa mass to buffer it, catches and seizes into a grainy mess far more easily than dark chocolate does. Let the retained heat finish the job rather than the direct flame. Whipping the cream only to a soft foam, not stiff peaks, matters because you're folding chocolate into it afterwards — overwhip now and you'll knock the air back out fighting a too-stiff cream to combine it evenly, and end up with a dense cap instead of something light enough to pipe.

Four glasses here, which tells you something about where this dish lives — it's a dinner-party plate, not a family pudding you dish out after a roast. That's fine; just don't scale the gelatine linearly if you double it for a bigger table, because set strength doesn't always travel one-to-one with volume in a wide, shallow domestic fridge where cold air circulates less evenly than a professional blast chiller. If you're doing this in an ordinary UK kitchen with one fridge shelf and no bain-marie pan, a heatproof bowl sitting in a saucepan of just-boiled water does exactly the same job as any specialist kit — the method doesn't need a kazan or a pastry kitchen, just attention and the willingness to wait.