Calamansi juice

Calamansi , also known as calamondin, Philippine lime, or Philippine lemon, is a citrus hybrid cultivated predominantly in the Philippines. It is native to the Philippines, parts of Indonesia (Borneo, Sumatra, and Sulawesi), Malaysia, and Brunei, as well as parts of southern China and Taiwan. Calamansi is ubiquitous in traditional Philippine cuisine. It is naturally very sour, and is used in various condiments, beverages, dishes, marinades, and preserves. Calamansi is also used as an ingredient in Malaysian and Indonesian cuisines.

Source: Wikipedia