Ingredients
- 6 large yellow onions (about 4 pounds)
- 4 slices bacon (about 3 ounces), diced
- 1 sprig fresh thyme
- 1 sprig fresh rosemary
- 1 sprig fresh sage
- 1/8 teaspoon kosher salt, plus to taste
- Pinch sugar
- Freshly ground black pepper, to taste
- 1/4 cup white wine
- 1/4 cup heavy cream
- 3/4 cup grated Gruyere cheese (about 3 ounces)
- 2 teaspoons Dijon mustard
- 1 tablespoon unsalted butter, plus for buttering the dish
- 1/3 cup fresh breadcrumbs
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