→ For the Mornay Sauce
01 -
4 tablespoons unsalted butter
02 -
1 small onion, finely chopped
03 -
4 tablespoons all-purpose flour
04 -
3 cups whole milk, at room temperature
05 -
1 egg yolk
06 -
1/4 teaspoon freshly grated nutmeg
07 -
1 teaspoon kosher salt
08 -
1/2 teaspoon ground black pepper
09 -
1 1/2 cups grated Emmental or Swiss cheese
10 -
1 cup grated raclette or other melting cheese
→ For Assembly
11 -
1 pound fresh lasagna sheets
12 -
12 ounces thick-cut deli ham, sliced
13 -
2 tablespoons unsalted butter, for greasing
14 -
1/2 cup grated cheese, for topping (Emmental or raclette)