Cut off a lid from the pumpkin (approx. the upper quarter) and remove the seeds with a ball cutter. Use the ball cutter to remove approx. 400 g pumpkin flesh and cut it into small pieces.
Put the canned tomatoes in a deep plate and cut them into small pieces. Peel and finely chop the onion. Heat the oil in a large frying pan. Fry the minced meat in it until coarsely crumbly. After about 3 minutes, add diced onion and pumpkin flesh, then stir in tomato paste.
Deglaze with stock and tomatoes. Season the ragout with salt, pepper and paprika. Simmer for about 10 minutes, stirring occasionally. Clean the leek, cut into rings and wash. Drain leek rings well.
Wash parsley, shake dry and chop the leaves of 3 stalks coarsely. Blanch the leek in boiling salted water for about 2 minutes, then rinse under cold water. Shortly before the end of the cooking time add leek and chopped parsley to the ragout.
Arrange the ragout in the pumpkin and garnish with 1 stalk of parsley.