Roget Hellefisk med Peberrodscreme

There's a moment at a proper Danish lunch when the cold kitchen shows its full range. The herring has come and gone, the aquavit has done its first round, the table has settled into conversation. Then something quieter arrives: a piece of pale smoked halibut on dark rye, a white peak of horseradish cream, a scatter of cress, a twist of lemon. This is smorrebrod at its most considered, and it belongs to the festive lunches of winter and early spring, when smoked fish is at its best and the table wants a piece that feels like an occasion.

Roget hellefisk med peberrodscreme is a piece from the refined end of the cold kitchen repertoire, the one the smorrebrodsjomfru mastered in the old Copenhagen lunch restaurants. Greenlandic halibut, smoked slowly over beech wood, arrives at the counter already halfway to finished. Your job is not to interfere with what the smokehouse has done. Your job is to build the piece so that every layer does its work: the butter against the damp rye, the fish catching the light, the cream biting the back of your nose, the cress waking the whole thing up.

Pay attention to the horseradish. Fresh root, grated the moment you need it, folded through cold cream with a whisper of lemon and sugar. Bottled horseradish will ruin this, and I say that gently but I mean it. The heat in fresh horseradish is bright and alive and it fades within an hour of grating. That's the one rule you can't bend. Everything else is a matter of handling the layers with care and trusting what you see on the plate. You'll know when it's right.