French Onion Mac and Cheese
Ingredients
- 6 tablespoons unsalted butter, divided
- 3 onions (1 ½ pounds total), thinly sliced (about 4 cups)
- 1 teaspoon chopped fresh thyme, or ½ teaspoon dried, plus more leaves for serving
- Kosher salt and freshly ground pepper
- ¼ cup dry white wine, such as Sauvignon Blanc
- 1 tablespoon Dijon mustard
- 1 teaspoon crumbled beef bouillon (from 1 cube; optional)
- 12 ounces medium shell pasta
- ⅓ cup unbleached all-purpose flour
- 3 cups whole milk
- ⅓ pound Gruyère, grated
- ⅓ pound fontina, grated
- ⅓ pound Emmentaler, grated
- 3 cups torn rustic bread, or 12 slices (each ½ inch thick) baguette (about 4 ounces total)
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