it got its name because it has tuna in it and they melt it

No.

moisture

There are many recipes for patty melt sandwiches, but basically, a patty melt sandwich is a cooked hamburger patty with a generous amount of melted cheese on top. The patty is placed between two pieces of bread and toasted in a hot skillet in a little melted butter.

No not really. But a good tip to try when making panini sandwiches would be to reheat the sandwich in the oven to melt the cheese. Then, take a clean cutting board and squish the sandwich to make it flat. There you have a perfect panini sandwich/bread!