Description
A classic French Onion Soup recipe that reveals the secret to achieving perfect caramelized onions and a rich, flavorful broth topped with melted cheese.
Ingredients
Scale
- 4 tablespoons unsalted butter
- 5 large yellow onions, thinly sliced
- 1 teaspoon salt
- 1 teaspoon granulated sugar
- 2 cloves garlic, minced
- 1/2 cup red wine
- 32 ounces low-sodium beef broth
- 24 ounces low-sodium chicken broth
- 1 tablespoon Worcestershire sauce
- 2 sprigs fresh thyme
- 1 bay leaf
- 1/2 tablespoon balsamic vinegar
- pinch of salt and freshly ground black pepper, to taste
- 5 1-inch thick slices of French bread
- 2 tablespoons extra-virgin olive oil
- 1 & 1/2 cups shredded Gruyere Swiss cheese, room temperature
- 1/4 cup shredded Mozzarella cheese, room temperature
- 2 tablespoons finely grated Parmesan cheese, room temperature
Instructions
- In a large pot over medium-high heat, melt the butter. Add in the onions and sauté, stirring often, until softened, about 10 minutes.
- Reduce heat to medium, stir in the salt and sugar; cook for another 35 minutes, stirring occasionally (every 5 minutes or so), until onions are caramelized and almost syrupy.
- Add in the garlic and cook until fragrant, about 1 minute.
- Pour in the red wine to deglaze the pot, scraping up any brown bits on the bottom and sides.
- Add in the beef broth, chicken broth, Worcestershire sauce, thyme, and bay leaf.
- Gently simmer over medium/medium-low heat for about 20 minutes, stirring occasionally.
- Remove and discard the herbs.
- Mix in vinegar and taste. Season with additional salt and pepper, if necessary.
- Reduce heat to low, cover to keep hot while you prepare the bread.
- Preheat oven broiler, with rack 6 inches from the heat source. Arrange bread slices on a baking sheet and brush both sides with the olive oil. Broil 2-3 minutes, flipping once, until well toasted on both sides.
- Arrange oven safe bowls or crocks on a rimmed baking sheet. Fill each bowl 2/3 full with hot soup. Top each bowl with 1 slice toasted bread, and sprinkle with the Swiss, Mozzarella, and Parmesan cheeses.
- Broil until bubbly and golden brown. Serve and enjoy!
Notes
- Keep an eye on the bread while broiling to prevent burning.
- Every oven is different, so adjust broiling time as needed.
Nutrition
- Serving Size: 1 bowl
- Calories: 450
- Sugar: 5g
- Sodium: 800mg
- Fat: 25g
- Saturated Fat: 15g
- Unsaturated Fat: 5g
- Trans Fat: 0g
- Carbohydrates: 40g
- Fiber: 3g
- Protein: 15g
- Cholesterol: 60mg
Keywords: French Onion Soup, Soup Recipe, Comfort Food