Dong gua, also known as winter melon, is a type of gourd commonly used in Asian cuisine. It has a smooth, green skin and a mild, slightly sweet flavor. The flesh is pale and watery, making it a popular ingredient in soups, stews, and stir-fries. This vegetable is low in calories and rich in vitamins, particularly vitamin C and B vitamins. It is often praised for its hydrating properties and is believed to have various health benefits, including aiding digestion and promoting skin health.