We bought bocconcini, bite-sized mozzarella balls, to make the process even quicker, but you could also cut a big ball of mozzarella into chunks. On each skewer, we put three grape tomatoes and one piece of cheese.
For the basil oil, we blended a couple of handfuls of fresh basil leaves in a blender with enough olive oil to make it fluid and creamy. We put it through a strainer, thinking we'd get clear green oil on the other end, but most of the basil bits came through the sieve. Next time we won't bother with that step; the bits of basil are a nice pop of color anyway.
Because we were transporting this platter to another location for the party, we put our basil oil in a squeeze bottle and squirted it on once we got there. Done!
(Images: Elizabeth Passarella)