Peel the pumpkin and remove the seeds. Cut the pumpkin flesh into cubes. Peel and finely dice onions. Knead minced meat and diced onions, season with salt, pepper and paprika. Form small balls.
Clean, wash and cut the fennel into strips. Fry the meatballs in hot oil all around, remove. Sauté the fennel in the frying fat. Add stock and bring to the boil. Add lentils and cook for about 20 minutes.
After 10 minutes add the pumpkin. Season stew with salt, pepper, sugar and vinegar. Wash the chives, cut into small rolls and sprinkle the stew.