French Onion Soup
Treat yourself to a gourmet experience with this slow-cooker french onion soup. Requires only ten minutes of hands-on time and fewer than ten ingredients.
Ingredients
- 3 pounds yellow onions peeled and sliced
- 2 tablespoons butter unsalted
- 2 tablespoons olive oil
- 1 teaspoon salt plus more to taste
- Freshly ground black pepper
- 2 tablespoons balsamic vinegar
- 10 cups Kettle & Fire Beef Bone Broth
- 3 tablespoons Sherry optional
For assembling the soup:
- 6 baguette slices for each bowl
- 1/3-2 cups grated or shaved Gruyere cheese
- Chopped parsley for garnishing
Instructions
-
Place onions in a 6-quart slow cooker. Stir in butter and olive oil. Season with salt and pepper. Cover and cook on low for 12 hours.
-
Add balsamic vinegar and beef bone broth into the slow cooker. Add sherry if using.
-
Cover and cook on low for another 6-8 hours.
-
Preheat oven to 350°F.
-
Portion and ladle the soup and onions into oven-safe bowls and place the bowls on a baking sheet.
-
Top each bowl with a slice of toast and a generous amount of grated or shaved Gruyere cheese.
-
Bake on a rack in the upper third of the oven for 20-30 minutes or until the cheese is melted.
-
Switch oven to broil and broil the soup for 2-3 minutes until the cheese is browned.
-
Garnish with chopped parsley and serve warm.