Slow Cooker French Onion Soup
Ingredients
- 3 pounds onions, sliced
- 3 tablespoons butter
- salt and pepper to taste
- 6 cups beef broth (or vegetable broth)
- 1 teaspoon fresh thyme, chopped (or 1/2 teaspoon dried thyme)
- 1 tablespoon balsamic vinegar
- 2 teaspoons Worcestershire sauce
- 8 slices baguette, toasted
- 1 cup gruyere, grated
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