Mix flour, mineral water, 2 eggs and salt to a smooth dough. Heat the oil in a pan. Bake 8 pancakes of about 24 cm Ø. Peel and chop the onions. Soak toast in cold water.
Chop 4-5 sage leaves and 1 teaspoon rosemary needles. Knead with toasted bread, minced meat, diced onion, 2 eggs and 40 g cheese. Season with salt and pepper. Divide the minced meat into eight pieces and wrap it in the pancakes like sausages.
Place in a flat casserole dish. Whisk the remaining eggs with salt, pepper and nutmeg and pour over the pancakes. Place a sage leaf on each of the upper rolls and sprinkle with the rest of the cheese.
Bake in the preheated oven (electric oven: 200 °C/ gas: level 3) for 30-35 minutes. Garnish with rosemary and sage before serving.