Instructions
Step 1
Using a serrated knife, slice the rolls in half horizontally. Transfer the bottom halves, cut-side up, to a large baking dish. Top evenly with the cheese, followed by the ham. Cover with the tops of the rolls.
Step 2
In a small bowl, whisk together the butter, mustard, poppy seeds, and Worcestershire sauce. Drizzle the sauce evenly over the tops of the sandwiches, cover the pan with aluminum foil, and set aside for at least 30 minutes, or up to 24 hours.
Step 3
Position a rack in the center of the oven and preheat to 350°F. Bake until the cheese is melted and the sandwiches are warmed through, 20–25 minutes. Slice between the rolls, and serve warm or at room temperature.