Make mayonnaise through slowly including oil. Emulsify with egg yolk and acid for a steady, creamy spread or dressing base.

https://pipewiki.org/wiki/index.php/Mastering_the_Art_of_Stir-Frying:_Techniques_and_Recipes

Make mayonnaise with the aid of slowly adding oil. Emulsify with egg yolk and acid for a solid, creamy spread or dressing base.