To serve this soup in traditional French fashion, top each bowl with a small slice of toasted bread or a few croutons.
Heat the olive oil over medium-high heat in a large soup pot. Add the onions and saute for 5 minutes, stirring constantly. Reduce heat to medium and continue to cook for 15 to 20 minutes until caramelized. Add the broth, water, thyme, soy sauce, bay leaves and pepper. Simmer for 20 minutes. Remove the bay leaves.
Preheat the oven to broil. Pour soup into 8 individual oven-proof soup bowls and top with cheese. Place bowls on a baking sheet. Broil soup for about 1 minute until cheese is melted; serve.
Created by the executive wellness chef and registered dietitians at the Mayo Clinic Healthy Living Program.
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