1. In a large pan over medium to low heat, cook onions, sugar, black pepper and oil; keep stirring for 20 minutes, or until caramelized.
2. Add broth and Worcestershire sauce; bring to a boil. Reduce heat and simmer for 30 minutes.
3. Slice French bread and toast it. Ladle soup into ovenproof bowls, add bread and cheese on top. Put under broiler until melted.
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