Gruyere Soup

Preparation:

Preparation: Put the cheese in a bowl. Fry the thinly sliced onions in the butter and 2 tablespoons of oil over low heat. Incorporate 40 g of flour and cook again for 5 minutes, stirring. Gradually add the broth, salt and pepper, cover and cook for 15 minutes. Arrange the slices of bread on the plates, sprinkle them with the grated cheese and pour the onion broth. Leave to rest for 5 minutes and serve.