1. Preheat oven to 300 degrees.
2. In a small saucepan, add all ingredients for the butter mixture and place over medium-low heat. Let melt until needed.
3. In a larger saucepan add in butter and flour over medium heat for the white sauce. Cook for 2-3 minutes until the flour taste has been cooked out and the roux has begun. Slowly add in milk (cream or half and half can be used as well. I used whole milk for this recipe) 1/2 cup at a time and whisk until thick and combined. Whisk generously to make sure all clumps are out and that the mixture doesn't scorch on the bottom of the pan. The mixture will eventually thicken.
4. Once at a thick consistency, add in parmesan and stir until melted. Add in nutmeg. Then salt and pepper to taste.
5. If it gets to thick add in more milk however you will want this mixture on the thicker side for this recipe. Think more a gravy consistency rather than Alfredo.
6. In a skillet (or the oven) cook the bacon until crispy. Place on paper towel and let cool. Break into quartered pieces.
7. Slice tomatoes into quarters and set aside.

To assemble sandwiches:

1. Slice Hawaiian rolls in half and break each piece apart. Line the bottom of the rolls in a 9x13 dish.
2. Place a small amount of mayo on the bottom of each roll. It doesn't take much, just enough to cover the bottom but you should be able to see the roll underneath - about a 1/2 teaspoon or so on each roll.
3. Place 1 slice of turkey on each sandwich.
4. Place 3 of bacon quarters on each sandwich.
5. Sprinkle the tomatoes over all the sandwiches.
6. Spoon a generous amount of white sauce over top each roll. 1-2 tablespoons for each roll. You will have leftover sauce (perfect for dipping sandwiches in!).
7. Sprinkle remaining parmesan cheese over top (mozzarella or white cheddar will work as well).
8. Place tops of rolls back on and brush each top with the butter mixture. Be generous with this as well - use most if not all of the mixture. Pour over the top if needed, just make sure each top is coated.
9. Place foil over the top of the pan and place in the oven for 20-25 minutes.
10. Serve immediately and ENJOY!