Ingredients
- 4 tablespoons unsalted butter
- 6 yellow onions (approximately 1 pound), sliced 1/4-inch thick
- 1 teaspoon kosher salt, plus more as needed
- 1 teaspoon sugar
- 1/2 cup dry sherry
- 8 cups beef broth
- 6 fresh thyme sprigs, tied with butcher's twine
- 1 bay leaf
- Freshly ground black pepper
- 1 baguette, sliced on the bias into 1/2-inch slices
- Olive oil, for brushing
- 8 slices Gruyère
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