Hvide Kartofler med Persille

December in Denmark is the darkest month and the brightest table. The julefrokost spreads across hours, and at the centre of the plate, two kinds of potatoes: brunede kartofler, glossy and caramelized in sugar, and these. Hvide kartofler med persille. Plain boiled potatoes finished with warm butter and a generous handful of chopped parsley.

The brunede kartofler get all the attention. They're the ones people talk about, the ones visitors photograph. But the hvide kartofler are what hold the plate together. They catch the pan juices from the flæskesteg. They absorb the sweetness of the rødkål. They give your palate somewhere to rest between all that richness. Without them, the Christmas plate has no centre of gravity.

The technique is almost nothing. Small waxy potatoes, peeled, boiled in well-salted water until tender, then turned gently in warm butter with parsley scattered over them. But "almost nothing" is not nothing. The potato variety matters. The water needs enough salt. The butter should be warm, not browned. And the parsley must be fresh, chopped at the last moment, because dried parsley in this dish is a kind of betrayal. I'll walk you through each step so you understand why it's done this way. Once you do, you'll never second-guess it. This is the dish that makes the rest of the Christmas plate make sense.