In a food processor bowl fitted with a metal blade, place the basil leaves and garlic cloves. Pulse until both are coarsely chopped. Add enough olive oil until your desired sauce consistency is achieved.
To store: Cover the surface of the sauce with a thin layer of oil oil. Store the sauce in an airtight container in the refrigerator or in the freezer. Stir to recombine the ingredients prior to use.
Recipe courtesy of Jessica Fisher, Good Cheap Eats