Sød Sennepssauce til Gravad Laks

Gravlax without sennepssauce is like bread without butter. You can do it, but you shouldn't. In Denmark, nobody would think to serve one without the other. They arrive together, always: the coral-pink salmon, silky from its days under salt and sugar and dill, and beside it a bowl of this sauce, thick and golden, sharp with mustard, sweet with sugar, green with so much dill it looks like a garden in a bowl.

The sauce itself takes ten minutes. That's all. You whisk mustard with sugar and vinegar until the sugar dissolves, then drizzle in oil slowly until it thickens into something that holds a trail from the whisk. Then you fold in the dill. There's no cooking, no heat, no special equipment. But those ten minutes contain one moment that makes the difference between a sauce and a dressing: the emulsification. Add the oil too fast and the sauce breaks, thin and greasy. Add it slowly and the mustard binds everything into a thick, glossy suspension that clings to the salmon and holds its own against the richness of the fish.

I want you to taste as you go. The balance is everything: sweet, then sharp, then that slow mustard warmth at the back of your throat. If it leans too far in any direction, you'll know, and I'll tell you how to bring it back. This is a sauce cooked with love, made entirely by hand, and once you've made it yourself you won't go back to a jar.