What is the result of repeatedly testing a recipe? a recipe that has been tested repeatedly that yields consistent quality is called

I believe that the answer is recipe standardization

Standardized recipe

Explanation:

A Standardized recipe refers to instructions to make a recipe that is the same in taste and appearance everytime it is made. This will include the name, the ingredients, the size of the portion, the prepration directions and the plating. A  standardized recipe helps to ensure quality and quantity consistency. According to this, a recipe that has been tested repeatedly that yields consistent quality is called standardized recipe.

answer; i believe the correct answer is "he who gladly serves"