Mix eggs, 38 l milk, 1 pinch of salt and 200 g flour to a smooth dough. Leave to swell for approx. 30 minutes
Peel and chop the onion. Sauté in 2 tbsp. hot fat in a pot. Fry 2 tbsp. flour in it. Stir in 1/4 l milk, 1/4 l water and stock. Bring to the boil, simmer for about 5 minutes. Grate cheese, melt half of it. Wash, chop and stir in parsley. Season to taste
Clean, wash and slice the mushrooms. Fry them vigorously in 2 tablespoons of hot fat. Season with salt and pepper. Stir in half the cheese sauce
Heat oil in portions in a coated pan (approx. 26 cm Ø). Bake 6 pancakes one after the other from the dough. Cover each pancake with 1 slice of ham and spread about 2 tbsp. mushroom-cheese sauce on each pancake. Roll up carefully
Cut the rolls into approx. 3 pieces each, place them in a greased casserole dish or ovenproof deep dish. Stir the rest of the cheese sauce with 5-6 tbsp. milk until thin and pour over. Sprinkle with the rest of the cheese. Bake in a preheated oven (electric cooker: 225 °C/circulating air: 200 °C/gas: level 4) for 15-20 minutes
Drink: cool white wine