What makes a great panini?
Even too much of the best bread or meat/cheese and a panino is out of whack.
Gotta have the right bread, the right flavor combo of meat with enough of a proper cheese accent, something to moisten it, and then it should be grilled enough to heat it through without frying the heck out of it.
An overstuffed panino is just wrong.
I am really glad that someone else in this country besides me realizes that one of these sandwiches is a panino. More than one are panini.
Seeing menus that list a plural word for a singular item drives me to distraction. Sort of like hearing someone ask, "Would you like a sandwiches"?
But, to return to the topic:
A decent amount of meat
A small amount of cheese
A little bit of arugala
Perhaps a bit a roasted red pepper