ACF Certification Practice Exam 2026 – Your Complete Study Guide

The term for the layer of fat that forms on the surface of cooling stock is known as a fat cap. This layer is created as the stock cools and the fat rises to the top, where it solidifies. The fat cap serves as a protective barrier that can help preserve the stock by preventing oxidation and contamination from the air. In culinary practice, this layer can also be skimmed off if a lower-fat stock is desired, or it can be left on for flavor when using the stock in recipes.

Understanding this concept is essential for chefs and culinary professionals, as managing the fat cap is part of the stock-making process, affecting both the flavor and texture of the final dish.