2 1/2 tablespoons of butter
1 tablespoon of olive oil
4 medium onions, finely sliced
1 tablespoonful of all-purpose flour
1 1/2 liters of cold chicken broth
Salt and black pepper to taste
16 thin slices of mini baguette, cut into four and toasted
2 tablespoons of grated Gruyère cheese
2 1/2 tablespoons of butter
1 tablespoon of olive oil
4 medium onions, finely sliced
1 tablespoonful of all-purpose flour
1 1/2 liters of cold chicken broth
Salt and black pepper to taste
16 thin slices of mini baguette, cut into four and toasted
2 tablespoons of grated Gruyère cheese
In a saucepan, melt the butter and olive oil
Add the onion and cook, stirring with a wooden spoon, until the onion is lightly golden
Add the flour and mix well
Then add the chicken broth
Stir
Season with salt and black pepper and let simmer for an hour and a half, over low heat, stirring occasionally
Distribute the soup in ramekins (small earthenware dishes)
Place toasted baguette slices on top of the soup and sprinkle with grated cheese
Put in the oven to gratinate for 10 minutes, at medium/high temperature
Serve very hot.