Native to Australia, the fingerling limes, or finger lime, is approximate 1 1/2 to 2 1/2 inches long and is filled with tiny caviar-shaped spheres that taste similar to the Mexican true lime (key lime). These limes have become quite popular with U.S. chefs. They are hard to find in the United States but you can buy the plants online. In California the finger lime trees bare fruit in November and December. You can also purchase the limes from Good Land Organics (see buy link under image).
In addition to using the fruit like citrus caviar, it can be used for jams and marmalade. Below are examples of the various colors of citrus caviar.
Pure natural lime