A mayonnaise plant is a facility where mayonnaise is produced on a large scale for commercial distribution. Mayonnaise is a popular condiment made from egg yolks, oil, vinegar, and spices.

The process of making mayonnaise involves emulsifying the egg yolks with oil to create a thick and creamy texture. Other ingredients such as vinegar, lemon juice, and spices are then added to flavor the mayonnaise. The entire process is typically done using industrial-scale equipment, with strict quality control measures in place to ensure consistency in the final product.