Easy Slow Cooker French Onion Soup
Ingredients
- 3 lbs white onions sliced
- 8 tablespoons unsalted butter
- 1 teaspoon salt
- 8 cups beef broth
- 1 tablespoon Worcestershire
- ¼ cup white wine or white cooking wine
- 1 tablespoon red wine vinegar
- 4 sprigs thyme plus additional thyme for topping
- Loaf of Italian bread cut into 3/4” slices, for topping
- 2 cups shredded Gruyere cheese
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