Soy Bean Oil
This constitutes the most-produced cooking oil in the entire world. Useful also because of the stability of its emulsification, and its ability to tolerate cold temperatures, this oil is easy to use in the production of mayonnaise.
The other basic ingredient is chicken egg. Eggs used for this purpose must be fresh, and must be heated to a particular temperature in order to kill off bacteria. Normally, both the yolk and the albumen of the egg would be used, but special Japanese-style mayonnaise only uses the yolk.
Vinegar is used to prevent the mayonnaise from spoiling, as well as adding flavour to the mayonnaise. The special sour taste from mayonnaise also adds deliciousness when eaten with other dishes.