Soak rolls in cold water. Peel 3 onions and chop them finely. Knead minced meat, ground pork, squeezed out roll, onions and 3 eggs. Season with salt and pepper. Form a round loaf (approx. 26 cm Ø) from the minced meat mixture and place it on a fat pan of the oven rinsed with cold water.
Pre-cook in the preheated oven (electric cooker: 175 °C/ circulating air: 150 °C/ gas: level 2) for approx. 1 hour. In the meantime, knead the contents of the baking mix bag with 340 ml of lukewarm water with the kneading hooks of the hand mixer for approx. 5 minutes to a smooth dough.
Form into a ball and cover and leave to rise in a warm place for approx. 30 minutes. Knead the dough again. Put some of the dough aside, covered. Roll out the rest of the dough on a floured tea towel round (approx. 46 cm Ø).
Take the meatloaf out of the oven and place it in the middle of the dough with the surface down. Whip into the dough. Separate 1 egg. Brush overlapping areas of the dough with egg white and press down firmly.
Clean the fat pan and grease it lightly. Put the minced meat pie back on top. Roll out the remaining dough and cut out e.g. small mushrooms with a cookie cutter. Whisk the egg yolk and 2 tablespoons of cream.
Spread the pastry with it. Glue dough mushrooms on top, also brush with whisked egg yolk. Bake the pâté at the same temperature for another 35-40 minutes. Clean the mushrooms and chop if necessary.
Dice the bacon and drain it in a pan without fat. Peel and finely dice 1 onion. Add to the bacon and fry briefly. Add mushrooms and fry for about 5 minutes. Add the rest of the cream and 1/4 litre of water.
Stir in stock and bring to the boil. Stir in sauce thickener. Season sauce with salt and pepper. Wash the parsley and chop it except for something to garnish. Stir into the mushroom sauce. Arrange pâté and sauce.