Calamansi is a small citrus fruit that is native to the Philippines and other parts of Southeast Asia. It is about the size of a golf ball, with a thin, fragrant skin that is green when unripe and orange when ripe. Inside, the fruit is juicy and acidic, with a flavor that is tart, tangy, and slightly sweet.

Calamansi can be eaten in a variety of ways. It can be sliced and squeezed to make a refreshing juice or used as a flavorful ingredient in marinades, dressings, and other dishes. The fruit is also commonly used in traditional Asian medicine for its many health benefits.

Calamansi is best enjoyed when it is ripe and fully mature. The skin should be orange in color and slightly soft to the touch. It's important to note that calamansi can continue to ripen after being harvested, so it's best to purchase them slightly underripe and allow them to ripen at room temperature.

Fresh calamansi should be stored in a cool, dry place away from direct sunlight, and can last for up to two weeks. It's also possible to freeze calamansi juice for longer storage.

Calamansi is a rich source of vitamin C, which can help boost the immune system and protect against colds, flu, and other illnesses. It also contains antioxidants, which can help prevent cell damage and reduce the risk of chronic diseases such as cancer and heart disease. Additionally, calamansi has anti-inflammatory and anti-bacterial properties, making it useful for treating skin conditions and promoting healthy digestion.