Ingredients
Scale
- 4 large onions, thinly sliced
- 2 tablespoons butter
- 1 tablespoon olive oil
- 4 cups beef or vegetable broth
- 1 teaspoon sugar
- Salt and pepper to taste
- 1 baguette, sliced
- 2 cups shredded Gruyere cheese
Instructions
- Heat butter and olive oil in a large pot over medium heat. Add onions and cook until caramelized, about 25 minutes.
- Stir in sugar, salt, and pepper; cook for another 10 minutes.
- Add broth and simmer for 15 minutes.
- Preheat oven to 375°F (190°C). Lay baguette slices on a baking sheet, top with cheese, and bake until bubbly and golden, about 10 minutes.
- Ladle soup into bowls, top with cheese toasts, and enjoy.
Notes
- Use a mix of sweet and yellow onions for depth of flavor.
- Caramelizing onions slowly ensures rich sweetness.
- Prep Time: 10 minutes
- Cook Time: 50 minutes
- Method: Stovetop, oven
- Cuisine: French
- Diet: Vegetarian
Nutrition
- Serving Size: 1 bowl with crouton
- Calories: 350 Kcal
- Sugar: 10g
- Sodium: 800mg
- Fat: 19g
- Saturated Fat: 11g
- Unsaturated Fat: 8g
- Trans Fat: 0g
- Carbohydrates: 35g
- Fiber: 4g
- Protein: 12g
- Cholesterol: 50mg
