Ingredients
- ¼ cup unsalted butter
- 5 pounds sweet onions (about 6 onions), thinly sliced
- ¼ cup dry sherry
- ¼ cup sherry vinegar
- ¼ cup worcestershire sauce
- 2 teaspoons thyme leaves
- Salt and freshly ground pepper
- 1½ cups chicken broth, preferably homemade
- 2 cups coarsely grated gruyère cheese
- 1 teaspoon finely chopped flat-leaf parsley
- 1 baguette, sliced and lightly toasted
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