Risengrød - Danish Rice Porridge December 10th and it's time to feed the elfs/nisser. According to Danish christmas traditions, risengrød is given to the elf aka nissen. Nissen lives in houses and on farms, and protects the people and animals who lives there against evil and misfortune. But nissen is more than a protector, he can also play tricks on you, and then he is called drillenissen. By giving nissen its favorite food, risengrød, during the month of december, he will for the m...