Calamondin is a small citrus fruit that is a cross between a sour mandarin and a kumquat. It is also known as calamansi or Philippine lime and is commonly grown in Southeast Asia, especially in the Philippines. The skin of the calamondin is thin and edible, while the flesh is juicy and has a tangy, tart flavor. It can be used in cooking, baking, and as a flavoring for drinks and desserts. Calamondin is rich in vitamin C and has various health benefits.