Nytårsaften in Denmark is not about the fireworks. It's about the table. The last dinner of the year is the one you take your time with, the one where the cloth comes out, the candles are lit before anyone sits down, and the food says something about how the year ends and how the next one begins.

Hummer Thermidor is that dinner. Two whole lobsters, poached until the shells go bright red, the sweet meat pulled from the claws and tails, folded into a sauce built from cognac, cream, mustard, and Gruyère, then spooned back into the shells and run under the grill until the top bubbles and turns deep gold. It is not a weeknight dish. It is not trying to be simple. It is the kind of cooking you do once or twice a year, when the occasion deserves your full attention and the people at the table deserve to feel celebrated.

Don't let the steps intimidate you. The technique is methodical, not difficult. Each stage is its own small task, and none of them are complicated once you understand what they're doing and why. Pay attention to two moments in particular: the cognac going into the sauce (it needs to reduce until the raw alcohol is gone and only the warmth remains) and the mustard going in after the sauce comes off the heat (because heat makes mustard bitter, and the whole point is its quiet sharpness against the cream). Get those two things right and the rest follows. You'll know when it's right.