Clean kale thoroughly in cold water. Remove stalks and center veins of the leaves. Cook until baretender in salted water. Drain well. Chop finely. Melt butter; gradually stir in flour. Mix well, gradually adding milk. Cook until thick and smooth. Stir in chopped kale. Add salt and sugar and heat throoughly.
Serving Ideas : Medisterpølse and small round browned potatoes.