Risengrød – ricepudding, porridge made out of rice, sprinkled with cinnamon and sugar, with a knob of butter in the middle. This is food for nisser, and almost every child, and a lot of grown ups. According to the Christmas tradition of nisser, it is important to place a bowl with risengrød on the loft, where the nisser lives. We still do that, just in case. Everyone knows how much confusion an angry nisse can create.
Recipe in english here