What is alum used for in cooking?

Alum, also known as potassium alum, is a chemical compound commonly used in cooking as a food additive for pickling and preserving fruits and vegetables. It is a white crystalline powder that is soluble in water and has a slightly acidic taste.

Alum is often used in pickling recipes to help maintain the crispness of fruits and vegetables by firming up their cell walls. It is also used as a leavening agent in baking recipes, particularly in recipes that call for egg whites to be whipped into stiff peaks.

In addition to its culinary uses, alum has also been historically used in traditional medicine for its astringent and antiseptic properties. However, it is important to note that alum should be consumed in moderation as excessive intake can have harmful effects on the body.

Overall, alum is a versatile ingredient that can be used in a variety of cooking applications to help improve texture, flavor, and shelf life.