I did not mearure the amount of mayonnaise vs pesto and think it is a personal choice on flavor anyways. I started with a few heaper Tablespoons of light helman's mayonnaise and kept adding a couple teaspoons to the mixture until I reached the desired taste.
It is great on panini or any type of sandwich.
This is a handcrafted dish from my travels to Peru.
Peruvian artwork, crafts and pottery are very impressive.
Tomato and Feta on Toasted Baguette with lettuce & pesto mayonnaise