Wash potatoes thoroughly and cook in boiling water for about 25 minutes. In the meantime, wash the meat, dab dry and cut into small cubes. Peel and chop the onions.
Clean and wash the broccoli and cut it into very small florets. Cook in 1/4 litre boiling salted water for about 5 minutes. Drain and collect the vegetable water. Heat the oil. Fry meat and onions for about 5 minutes, turning them over.
Season with salt and pepper. Deglaze meat with vegetable water, cream and crème fraîche, bring to the boil and thicken with sauce thickener. Heat broccoli in it. Roast sunflower seeds. Drain potatoes, cut lengthwise and fill with the ragout.
Sprinkle with sunflower seeds and cheese to taste. Garnish with lettuce, tomato and parsley and arrange on a plate.