You are here: Home » Recipes » French Onion Soup French Onion Soup Recipe by Relish Contributor Yield 8 servings Start your evening off with this special onion soup. Sophisticated presentation with simple preparation. PrintEmail Ingredients 1 tablespoon olive oil6 cups thinly sliced onions1/2 pound sliced baby protabellas1 teaspoon sugar4 garlic cloves, peeled and sliced1/4 cup sherry1 tablespoon Dijon mustard1/2 teaspoon dried thyme leaves2 tablespoons all-purpose flour6 cups beef broth1 cup white wine or cooking wine Salt and pepper to taste8 (1/2-inch thick) slices Frech bread, toasted1 cup shredded part-skim mozzarella cheese1/2 cup grated Parmesan cheese Instructions Heat olive oil and sauté onions and portabellas on medium heat in a large nonstick pot. Stir ingredients periodically until onions are soft, about 10-15 minutes. Add sugar and garlic; cook additional 15-20 minutes before adding sherry. Loosen brown bits from the pan. Add mustard, thyme and flour, and stir 1 minute. Add broth and wine, then bring to boil. Reduce heat and cook an additional 20-30 minutes, then season. Ladle soup into bowls, top with bread and cheese, then microwave to melt the cheese.