Bring 350 ml water to the boil, season with salt. Add rice and cook over low heat for about 20 minutes. In the meantime clean, wash and cut leek into rings. Heat the fat in a pot.
Sauté the leek in it. Dust with flour and sweat for about 1 minute. Deglaze with stock and cream while stirring. Cook for about 3 minutes at medium heat. Knead minced meat, fried onions, breadcrumbs, egg and tomato paste.
Season vigorously with salt and pepper. Shape the minced meat into about 16 balls. Heat the oil in a pan and fry the meatballs for about 10 minutes. Drain the rice if necessary. Drain the meatballs on kitchen paper.
Arrange rice, leek and meatballs on plates. Garnish with parsley and fried onions.