Combine the signature sauce ingredients in a small bowl and whisk together. This can be stored in a sealed container on the counter it does not need to be placed in the refrigerator.
Grab a sheet pan and cover it with aluminum foil so you won't have to clean up the pan.
Slice your roll and drizzle 1 to 2 teaspoons of signature sauce on the inside of both the top and bottom slices of bread. Place both pieces of bread on the foil-lined pan.
Place cheddar cheese on the bottom roll and place mozzarella on the top roll. Sprinkle some Parmesan cheese on both sides. Top the cheddar cheese with some chopped black olives.
Place a sandwich-sized pile of ham and salami directly on the foil. Broil the meat and cheese-topped bread for 4 to 5 minutes or until the bread is toasted lightly and the cheese is fully melted.
Place the warm ham on the cheddar cheese, and then top that with lettuce, thinly sliced red onion, and your tomato slices. Lightly salt the tomato.
Place the salami on top of the tomato slices, and then squirt some yellow mustard on the top of the roll. Close the sandwich, slice it in half, and serve.