Peel, wash and slice the potatoes. Clean, wash and cut leek into rings. Peel and finely chop the onion. Cook potatoes in boiling salted water for about 12 minutes.
Add the leek to the potatoes 5 minutes before the end of the cooking time. In the meantime, wash the meat thoroughly and cut into pieces. Heat the oil in a casserole and fry the meat in it, turning it over.
Add the onions. Pour the potatoes and leek on a sieve and drain. Season meat with salt and pepper, dust with flour, turn and deglaze with stock and cream. Let it braise for about 15 minutes.
Pour the pumpkin on a sieve and drain. Add potatoes, leek, green pepper and pumpkin to the ragout, season again with salt and pepper. Arrange the ragout in a bowl and garnish with parsley leaves as desired.