I bought some cheese and tomato focaccia and spread some pesto and roasted garlic on the inside of the sandwich. Then I added Singleton's cheese from England which tastes exactly like sharp cheddar. I also added roasted red pepper and shavings of asiago cheese (my favorite cheese for sandwiches and burgers).
I grilled the sandwich on my grill pan and used a heavy pot to make it more like a panini (sorry, no fancy panini maker yet!). Right before the cheese melted completely I added a few leaves of baby spinach.
This sandwich was excellent. Nothing special but definitely excellent.