Ingredients
Scale
Here’s everything you need to create this heartwarming dish:
- 4 large yellow onions, thinly sliced
- 2 tablespoons unsalted butter
- 1 tablespoon olive oil
- 2 cloves garlic, minced
- 6 cups beef broth (or substitute with vegetable broth for a vegetarian version)
- 1/2 cup dry white wine (optional, but adds depth of flavor)
- 1 tablespoon Worcestershire sauce
- 1 teaspoon dried thyme
- 1 bay leaf
- Salt and pepper to taste
- French baguette, sliced
- 2 cups shredded Gruyère cheese (or substitute with Swiss cheese for a milder flavor)
Instructions
Let’s bring this dish to life, one step at a time:
- In a large skillet, melt the butter with olive oil over medium heat. Add the sliced onions and cook, stirring occasionally, until they are caramelized, about 25-30 minutes. This step is crucial for developing the rich flavor of the soup.
- Add the minced garlic to the skillet and sauté for another minute until fragrant.
- Transfer the caramelized onions and garlic to your slow cooker.
- Pour in the beef broth, white wine, Worcestershire sauce, dried thyme, bay leaf, and season with salt and pepper.
- Set your slow cooker to low and cook for 6-8 hours, or on high for 3-4 hours. The longer cooking time allows the flavors to meld beautifully.
- Before serving, remove the bay leaf and adjust seasoning if necessary.
- Preheat your oven’s broiler. Ladle the soup into oven-safe bowls, top with a slice of baguette, and generously sprinkle with Gruyère cheese.
- Place the bowls under the broiler until the cheese is bubbly and golden brown, about 2-3 minutes.
- Prep Time: 15 minutes
- Cook Time: 30 minutes
- Category: Main Dish
- Method: Cooking
- Cuisine: International