Mayo is known as permanent emulsion. Within the egg yolk there is lecithin which is a very good emulsifier which keeps together. u003cbr/u003eu003cbr/u003eDairy is a product that is a milk product from a mammal. This may include cows, sheep, goats, and other animals. Mayonnaise does not actually contain any milk products in it. u003cbr/u003eu003cbr/u003eWhich means that if you are dairy-free you can safely consume this dish.