I can't remember where I first heard this idea, but I like it.
Make up a big batch of pesto and freeze the leftovers in an ice cube tray. Once solid, pop them out and seal the cubes in a freezer safe bag. Now you can have single servings of pesto whenever you want! Perfect for dropping into a bowl of tomato soup.
My basil plants were getting over loaded a few weeks ago so I thought I'd give it a go. Worked like a charm.