Make this recipe a recipe that people in that category can eat. categories: ['low_carb'], 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: heat butter over low to medium heat in large stock pot. sauté onions to soft and golden brown. deglaze with .33 cup beef stock. sauté onions to caramelize slightly darker. deglaze with .33 cups beef stock again. caramelize onions to dark brown. add stock and bring to a boil. reduce to a simmer and allow flavors to blend, about 20 minutes. while soup simmers, cut bread into .5 inch thick slices. toast slices in oven or under broiler. season soup to taste and add sherry. fill crocks with hit soup. top with toasted crostini and cheese. pass under broiler until cheese bubbles and browns. serve immediately.