Basil-infused olive oil (plain EVOO will do, but I had this on hand), pignoli, fresh garlic and about 4 ounces of Tomme Collins (not pictured). Actually, any hard grating cheese you like will do.
A half jar of pignoli whizzed with the garlic, all of the basil (just jam it in there) and a tablespoon of oil to start the process. Then add a slow stream of oil (about 1/4 cup) as the processor works to get a not-quite smooth paste. (NOTE: you may add the cheese in this step if you have a large food processor, but I don't, so I am adding it at the end.)
I'm really happy that the following week, we got basil again (purple this time) - more pesto!!