- 10 mins
- 505 mins
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Ingredients
- 4 large onions, sliced
- 2 tablespoons butter
- 1 teaspoon sugar
- 2 quarts beef broth, no sodium added
- 1/4 cup sherry
- 2 sprigs fresh thyme
- 1 1/2 teaspoons salt
- Pepper to taste
- 1 cup croutons, plain
- 8 ounces Gruyere cheese, sliced (can substitute with Swiss)
Preparation
Step 1
Place onions, butter, sugar and salt in the bottom of a 6-quart slow cooker. Cover and cook for 7 hours on high, or until onions are soft and brown.
Add beef broth, sherry, thyme sprigs and pepper to taste. Cover, and cook on high for another hour. Sprinkle croutons across the surface of the soup. Add sliced Gruyere cheese and serve.
Pro tip: Cook for another 15 minutes to melt cheese even further.