Calamansi, or Kalamansi, is a citrus fruit native to the Philippines. I saw many calamansi trees in the Cagayan Valley. This is where I got my first taste of the fruit. It seems to be almost like a hybrid of a Lemon and a Tangerine. It is often called the Chinese Orange. The taste, to me, was a bit sour, but is can be squeezed into juice or tea.