Using a mandolin on a very thin setting, shave zucchini. You don't want to use skin heavy sides, nor do you want to use the very seedy core. Probably only 2-3 good strips from first side. Turn zucchini over to fresh half, and repeat. Rinse and dry basil leaves, and cut them down the middle. Lay out a strip of zucchini, and place basil halves, then spoon good amount of tomato paste mixture all the way down. Carefully, but tightly, roll. Set against side of cutting board so they don't unravel.