Onions peel and in thin slices plan or cut. Steam in hot fat until translucent. Deglaze with wine and 1 l water, bring to the boil. Stir in stock and simmer covered for about 15 minutes
Wash the parsley and chop finely, except for something to garnish. Add to the soup. Season to taste with salt and pepper
Pour onion soup into 4 ovenproof soup bowls and place 1 slice of bread on each. Grate cheese and sprinkle on bread. Bake in a preheated oven at the highest setting until the cheese has melted. Garnish with the rest of the parsley
You can cook the onion soup the day before. Before gratinating, heat it up again thoroughly. If you do not have any ovenproof soup bowls:
simply bake the slices of bread separately on baking paper and place them on the soup to serve or add them separately