Korvelsuppe

There's a week in April when the chervil comes back. You notice it first at the market: small bunches of feathery pale green leaves, more delicate than parsley, smelling faintly of anise and something that might be hay or might be memory. This is the herb that tells Danish cooks the winter is over, and korvelsuppe is the bowl we make to mark the moment.

Korvelsuppe belongs to Easter. It belongs to the long tables where families come together after a winter of dark evenings and root vegetables, and it carries on its surface everything the spring has promised. A light chicken broth, thickened just enough with a white roux, finished with cream and a generous handful of finely chopped chervil stirred in off the heat. Small poached dumplings called melboller, made from choux dough and the size of hazelnuts. Halved boiled eggs, one of the oldest symbols of the season. Nothing here is difficult. Everything here is timed with care.

The one thing I want you to hold in your mind is this: chervil cannot boil. The second it touches heat that's too high, the color goes grey and the anise note disappears. So the soup is built first, seasoned first, and held off the heat when the chervil goes in. The residual warmth does the work. You'll see the whole pot turn green in front of you, and you'll understand why this dish only exists at the beginning of spring. The season decides, and in April the season says chervil. That's not a rule, it's a gift.