Simple Pesto Mayonnaise

"I first tried Pesto Mayonnaise when we were at our granddaughter's ski meet. She had a sandwich with Pesto Mayonnaise on it--delicious. When I got home I bought some fresh basil at the grocery store and made some Pesto. Lots of work, just for a sandwich spread. So the next time we wanted it and I didn't have fresh basil....guess what? I came up with this yummy substitue and you can have it anytime; it is so easy and takes only a couple of minutes to make. I only make enough for a few sandwiches and then make it again, the next time."