Winter melons, also known as white gourd or ash gourd, are large, green-skinned fruits commonly used in Asian cuisine. They can grow up to 2 feet long and have a mild, slightly sweet flavor. The flesh is pale and watery, making it ideal for soups, stews, and stir-fries. These melons are harvested in late summer and can be stored for several months without refrigeration, which is why they are called "winter" melons. They are low in calories and rich in vitamins, making them a healthy addition to various dishes.