Clean and clean the mushrooms and cut them in half lengthwise. Peel onions and cut them into thin slices. Wash parsley and dab dry. Put 1-2 stems aside for garnishing. Pluck the remaining parsley from the stalks and cut into strips.
Heat 1 tablespoon of oil in a large frying pan. Peel and crush the garlic. Fry the mushrooms and onions for about 6 minutes until golden brown. After 2 minutes add rosemary, thyme, garlic and fry.
Season with salt and pepper. Take out the mushrooms and let them drain. Heat the roasting tin again, stir in the flour and sweat briefly. Deglaze with vinegar, wine, bouillon and cream. Bring to the boil, briefly reduce to a creamy consistency and add parsley.
Wash the meat, dab dry and cut into thumb-thick strips. Season with salt and pepper. Heat 1 tablespoon of oil in a frying pan and fry the meat for about 5 minutes, turning it over. Add mushrooms, meat and onions and an ovenproof dish.
Pour the sauce over the mushrooms evenly. Sprinkle the cheese on top and bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 35 minutes until golden brown. Garnish with parsley.
It goes well with bread.