Ingredients:

• 4 tablespoons unsalted butter, divided
• 2 tablespoons all-purpose flour
• 1 cup whole milk
• 1/2 teaspoon kosher salt
• 1/8 teaspoon ground nutmeg
• 2 tablespoons whole-grain mustard
• 1 tablespoon honey
• 12 Hawaiian sweet rolls (such as King’s Hawaiian Original Sweet Rolls), split
• 1 pound thinly sliced deli ham
• 8 ounces Gruyère cheese, shredded (about 2 cups)
• 1 tablespoon chopped fresh flat-leaf parsley

Cooking Instructions:

1. Preheat oven to 400°F. Grease an 11- x 7-inch baking dish with 1 tablespoon of the butter.
2. Melt 2 tablespoons of the butter in a small saucepan over medium-high. Add flour; cook, whisking constantly, 1 minute. Slowly whisk in milk; bring to a boil, whisking constantly. Reduce heat to medium; cook, whisking constantly, until thickened, 4 to 5 minutes. Remove from heat; stir in salt and nutmeg. Set aside.
3. Stir together mustard and honey in a small bowl; set aside. Microwave remaining 1 tablespoon butter in a small microwavable bowl on HIGH until melted, about 20 seconds.
4. Arrange bottom roll halves in prepared baking dish; spread evenly with honey-mustard. Top evenly with ham, milk sauce, and cheese. Replace top roll halves; brush tops evenly with melted butter, and sprinkle with parsley. Cover with aluminum foil.
5. Bake in preheated oven 8 minutes. Remove and discard foil. Continue baking until cheese is melted and rolls are golden, about 5 minutes. Serve immediately.