A classic French soup made with caramelized onions in a rich beef broth, topped with crusty bread and melted Gruyère cheese.
15 min prep
60 min cook
4 servings
450 kcal/serving
Ingredients
4 tablespoons unsalted butter
4 large yellow onions, thinly sliced
1 teaspoon salt
1/2 teaspoon sugar
4 cups beef broth
1 cup dry white wine
1 bay leaf
4 sprigs fresh thyme
1 baguette, sliced into 1-inch thick rounds
2 cups grated Gruyère cheese
Instructions
In a large pot, melt butter over medium heat. Add onions, salt, and sugar. Cook, stirring occasionally, until onions are deeply caramelized, about 40 minutes.
Add wine and cook for 2 minutes, scraping up any browned bits. Add beef broth, bay leaf, and thyme. Bring to a boil, then reduce heat and simmer for 15 minutes. Remove bay leaf and thyme sprigs.
Preheat broiler. Ladle soup into oven-safe bowls. Top each with a baguette slice and a generous amount of Gruyère cheese.
Place bowls on a baking sheet and broil until cheese is melted and bubbly, about 3-5 minutes. Serve hot.
Tips
For extra flavor, use a mix of beef and chicken broth.
The soup can be made ahead and refrigerated; reheat and broil cheese just before serving.