Finger lime varieties. Finger limes are a micro-citrus originally discovered growing wild in Australia. The interior pulp can best be described as citrus pearls, or citrus caviar. The citrus pearls can be squeezed out of the finger lime and used in any place that you would use a lemon or lime. The flavor is similar to that of a lemon-lime-grapefruit combo, the juice bursts from the citrus pearls when bitten into.