Peel the onion and cut into thin rings. Sauté the onion in the butter, pour the flour over it, add the stock and wine, cover and continue to cook. Then stir well and season well with the spices.
Cut the toast into small cubes. Pour the onion soup into 6 fireproof soup cups, spread the bread cubes on top and sprinkle with cheese. Place the soup bowls in the oven and gratinate at approx. 250 ° for 10-12 minutes.