Calamansi is a fruit native to the Philippines. It is a hybrid of mandarin orange and kumquat. The fruit is about the size of a large orange with a thin, easy-to-peel skin and a segmented interior similar to that of a grapefruit. The flavor is not very strong but is somewhat tart with just a hint of sweetness. The calamansi fruit is frequently used in Filipino cooking, especially in marinades, sauces, and desserts. The calamansi is also one of the ingredients in the Filipino fruit cocktail.