I first tried Pesto mayonnaise when we were at our granddaughter's ski meet. She had a sandwich with it on it-delicious. When I got home I got some fresh basil and made some Pesto so we could have the mayonnaise. Lots of work. One day I wanted some and didn't have fresh basil-guess what? This is a yummy substitute and you can have it anytime, and it is so easy and takes only a couple of minutes. I only make enough for a few sandwiches; then make again next time.