How to make
Chop the onion into small pieces. Heat the butter and fry until soft. Add the flour and stir.
Top with about 3 1/3 cups (800 ml) of hot water and the wine. Season with salt, black pepper to taste and let it boil for 10-odd minutes. Cut the baguette, brush the slices with a little oil and rub them with garlic.
Toast and serve them with the onion soup, then sprinkle the soup with some chopped green onions.