I got a new grill pan for the stove and was just trying some things out and this turned out great. I actually grilled the chicken up the night before and then stored it in the fridge until the next afternoon. That way too, it gave me time to let the grill pan cool so I could clean it for the pressing of the sandwich. If you are using a grill pan you will need something heavy to place on top to press it, I used a pot that I just placed a heavy bottle of water into for the weight(Okay it looked a bit strange.. so if you have a panini press go right ahead and use it!, if not this does work!)Also this recipe is for one sandwich, but of course you can double or triple it to meet your needs. You can make your own pesto, but to save time I used store bought.