Make this recipe a recipe that people in that category can eat. categories: ['low_calorie'], recipe: melt butter in a large saucepan over medium heat. add onions and sea salt and cook, stirring occasionally, for 30 minutes or until onions are deep golden. add cider and simmer until reduced by half, then add stock and simmer for 10 minutes. season with pepper. meanwhile, place bread on a foil-lined tray and cook both sides under a hot grill until dried but not browned. spread with mustard and top with cheese, then grill until cheese bubbles and browns. serve soup topped with the croûtons and sprigs of thyme.

Target recipe: in medium saucepan, heat butter and saute the onions on low heat for 20-30 minutes until soft and golden brown, stirring often. add the garlic, thyme, salt and pepper and cook another 4-5 minutes. add beef broth and grape juice. cover and simmer for 15 minutes. taste for seasoning. (can be made ahead up to this point.) preheat oven to 400 degrees. place soup in 6 ovenproof bowls. top each bowl with a slice of french bread and about 1/4 cup grated cheese. bake for 5 minutes until cheese has melted. serve at once. serves 6.