Finely dice the bacon. Peel and finely dice the onions. Clean, wash and slice the mushrooms. Fry bacon crisply in a large pan. Add onions and mushrooms in portions if necessary and fry until golden brown.
Grate cheese. Wash the meat, pat dry and season. Place in a large greased casserole dish (approx. 45 cm long). First spread cheese, then mushroom mixture on top
Clean, wash and cut the leek into rings. Spread on the mushroom mass. Mix crème fraîche, cream and hunter's sauce with the whisks of the hand mixer until smooth. Pour over the mixture. Cover and chill for about 24 hours.
The next day, cook in the preheated oven (electric cooker: 175 °C/recirculating air: 150 °C/gas: level 2) for 50-60 minutes. Garnish. Serve with: Rösti or farmhouse bread
Drink: Juice or wine spritzer