To make Hawaiian ham roll sliders, first cut rolls into halves. Spread mayo onto one side, and put on a slice of ham and Swiss cheese. Replace the other half, bunching them together in a baking dish. Whisk poppy seeds, melted butter, Worcestershire sauce and Dijon mustard. Pour the sauce over the rolls, and cover with foil for 10 minutes. Bake at 350 degrees until the cheese melts. Uncover them, and cook for 2 minutes until the tops slightly brown.
The recipe calls for 6 slices of Swiss cheese cut into fourths, 24 slices of deli honey ham, 1/3 cup mayonnaise, 1 tablespoon onion powder, 1/2 cup melted butter, 1 tablespoon poppy seeds, 1/2 teaspoon
Worcestershire sauce and two packages of 12-count King’s Hawaiian Original Sweet Dinner Rolls. It serves 12 and is ready in 30 minutes after 10 minutes of preparation and 20 minutes of cooking.
AllRecipes.com also has a recipe that involves mixing poppy seeds, dried onion, Worcestershire sauce, butter and Dijon mustard in a bowl. First, separate the tops and bottoms of the rolls, and place the bottom pieces in a baking dish. Layer half the ham on the rolls, and then add Swiss cheese over the ham. Top with the remaining ham to create layers of ham and cheese. Replace the tops of the rolls onto the sandwiches, and pour the mustard mixture evenly over the rolls.
Bake in an oven at 350 degrees Fahrenheit until the cheese melts and the rolls are lightly browned, or bout 20 minutes. Slice the rolls through the cheese and ham layers, and serve warm.