Open the ciabatta rolls and spread pesto onto both sides.
Add two slices of cheddar cheese to one side of each sandwich. Add two slices of muenster to the other side.
Add the thinly sliced tomato to either side of the sandwich. Close each sandwich and spread butter on the outside of the rolls.
Heat a pan over medium heat. Add the sandwich and let it cook for 2-3 minutes on each side, or until the bread is golden brown. If your ciabatta roll is very large or fluffy, put something heavy on the sandwich (like another pan) to help weigh down the sandwich and cook it evenly.
Cut in half and enjoy while its warm!
