European sailors in the 1700s called this “midshipman's butter” because they liked to spread it on hardtack biscuits. It's a great vegan substitute for mayonnaise because it has no eggs in it, and you can also use it as a sandwich spread, a condiment for grilled meats, or as a dip for veggies or chips. From the article Avocado Madness!
This recipe dates to 1976, when W.C. created it for his first restaurant, the Morning Glory Cafe. It is meatless and dairyless, but "designed for a meat-eater's taste," according to W.C. It is easily frozen or canned.