Water chestnuts are a type of aquatic vegetable that grow in marshy areas and are commonly found in Asian cuisine. They are not actually nuts but rather corms, which are swollen underground stems. Water chestnuts have a crisp texture and a mildly sweet flavor, making them a popular ingredient in stir-fries, salads, and various dishes. These vegetables are typically sold canned or fresh. When fresh, they have a dark brown or black skin that needs to be peeled before consumption. Water chestnuts are low in calories and a good source of dietary fiber, contributing to their popularity as a healthy food option.