Ingredients
- 1 tablespoon unsalted butter
- 1 medium onion, finely chopped
- 1 1/2 teaspoons tomato paste
- 1/2 teaspoon chopped thyme
- 2 cups half-and-half
- Salt
- Freshly ground pepper
- 3 cups elbow macaroni (12 ounces)
- 4 ounces Gruyère, shredded
- 4 ounces sharp white cheddar, shredded
- 4 ounces imported Fontina cheese, shredded
- 1/4 cup freshly grated Parmigiano-Reggiano cheese
- 2 tablespoons panko bread crumbs
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