Radiatori al Forno

Name: Radiatori al Forno
Cook time: 45 min
Total time: 45 min
Cuisine: Italian, Mediterranean, European
Ingredients: 1 lb radiatori; 1 lb fontina cheese cut into 1/2 inch pieces; 4 oz smoked provolone cut into 1/4 inch pieces; 1 1/4 cups finely grated parmigiano-reggiano; 2 tablespoons unsalted butter sliced into pats; freshly ground black pepper; 2.5 cups whole milk; 1/2 stick unsalted butter; 1/4 cup all-purpose flour; pinch of freshly grated nutmeg; sea salt; onion; roasted asparagus (optional)