4 large onions, sliced
2 tablespoons butter
1 teaspoon sugar
2 quarts beef broth, no sodium added
¼ cup sherry
2 sprigs fresh thyme
1½ teaspoons salt
Pepper to taste
Sliced bread of choice (or croutons)
8 ounces Gruyere cheese, sliced (Swiss cheese is a suitable substitute)
Preparation
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