Ina Garten's Pastitsio

Name: Ina Garten's Pastitsio
Prep time: 1 h
Cook time: 45 min
Total time: 1 h 45 min
Cuisine: European, Italian, Mediterranean
Ingredients: 3 tablespoons olive oil; 1 large yellow onion, diced; 1 pound lean ground beef; 1 pound lean ground lamb (can substitute for pork); 1/2 cup dry red wine; 1 tablespoon minced garlic (3 large cloves); 1 tablespoon ground cinnamon; 1 teaspoon dried oregano; 1 teaspoon fresh thyme leaves; Pinch of cayenne pepper; 1 can (28 ounces) San Marzano tomatoes; Kosher salt and freshly ground black pepper; 2 1/2 cups low-fat milk; 4 tablespoons (1/2 stick) unsalted butter; 1/4 cup all-purpose flour; 1/4 teaspoon freshly grated nutmeg; Salt and freshly ground black pepper; 1 1/2 cups freshly grated Parmesan, divided; 2/3 cup Greek yogurt; 3/4 pound small shells, preferably ziti noodles