Ingredients
- 1/2 cup (1 stick) unsalted butter
- 2 pounds yellow onions (about 6 medium), halved and thinly sliced lengthwise
- 8 to 10 sprigs fresh thyme
- 1 teaspoon kosher salt, plus more for seasoning
- 1 teaspoon freshly ground black pepper, plus more as necessary
- 1 tablespoon flour
- 1 cup dry white wine
- 4 cups beef stock or low-sodium beef broth
- 2 cups chicken stock or low-sodium chicken broth
- 1 1/2 cups cubed ciabatta bread
- 3 cups grated Gruyere cheese
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