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 broccoli and divide into very small florets or cut stems into thin slices. 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.
Warm the broccoli in it. Roast sunflower seeds. Drain potatoes, cut lengthwise and arrange with the ragout in an ovenproof dish. Sprinkle with sunflower seeds and cheese to taste.
Bake in the preheated oven (electric oven: 200 °C/ gas: level 3) for about 15 minutes.