Drizzle a frying pan or panini press with olive oil or butter.
While that is warming up, spread one side of each sandwich with pesto.
Slice cheese and tomatoes to desired thickness, and add to the sandwich.
Top with salt and pepper, and a second slice of bread, and you are ready to “grill.”
I just used my all purpose skillet and pressed the sandwiches down with a lid. (Make sure to get olive oil or butter on both sides of the sandwich)
Lightly toast on both sides over medium heat until the cheese gets all nice and melted.
I also tried one with turkey in it, and it was awesome!