Peel, wash and slice the potatoes and cook them in boiling salted water for 5 to 8 minutes. Drain. Clean and wash broccoli and cut into florets. Cook in 1/8 litre boiling salted water and butter for about 8 minutes.
Drain and collect the brew. Mix the brew with sauce hollandaise and egg yolk. Fry pork fillet in hot oil on both sides for about 1 minute. Season with salt and pepper. Add frying fat to sauce and season again.
Place the potatoes and broccoli in a gratin dish. Place pork medallions on top and pour half of the sauce over them. Bake under the preheated grill of the oven for 5-8 minutes. Heat the rest of the sauce again, but do not let it boil.
Serve with coarse pepper sprinkles extra to the gratin.