Bring to a boil and then simmer for about 20 minutes.
Lightly toast the bread slices in the oven using the broiler
Place the toasted slices on top of the soup and sprinkle with grated cheese
Broil again for a few minutes to melt the cheese
Serve hot.
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Final Thoughts
To avoid crying while cutting the onions, you can put them in a plastic bag while cutting to protect your eyes!
Do not let the onions burn, otherwise the soup will have a pungent and bitter taste!