This recip was created for the RSC game 2018. You may use any kind of focaccia bread you like. Either a big one or four focaccia rolls. I used two small gluten free focaccia breads. You probably won't need the whole jar of pesto, but feel free to use as much of it as you like. Also you may use more mozzarella if you want it super cheesy. I had one large ball which I sliced very thinly. For the tomatoes, any kind is fine. Date or cherry tomatoes are great because they don't contain so much liquid so that the sandwich will not get too soggy. I used large tomatoes, though, and it was fine.