Make this recipe a recipe that people in that category can eat. categories: ['low_fat'], recipe: in large soup pot over medium heat, melt the butter. add the onions, cover and slowly cook until soft and translucent, stirring occasionally, about 15 minutes. add sugar and continue to cook until caramelized and rich brown in color, about 10 more minutes. add broth, vinegar, and salt and pepper to taste. simmer, covered for 20 minutes. heat broiler. ladle soup into 4 oven proof bowls. top each with a piece of toasted bread and 1/4 of the cheese. broil until cheese is melted and golden. be careful removing bowls from boiler.

Target recipe: * preheat oven to 350ºf. in a large saucepan, combine onions and sherry; sauté until onions are tender, about 6 minutes. * add broth and worcestershire sauce. bring to a boil, then reduce heat, cover and simmer for 10 minutes. * meanwhile, toast bread in oven until golden brown. * place one piece of toast into each of four bowls. divide soup among bowls and top each with 1/2 tablespoon of grated cheese. yields about 1 1/2 cups per serving.