Kaffir lime (Citrus hystrix) fruit is about the size of a western
lime. The fruit is dark green and round, with a distinct nipple on
the stem end. It has a thick rind, knobby and wrinkled, and one
of its common names is 'porcupine orange'. As the fruit becomes
older, the colour fades to a lighter, yellowish green. All parts of
the plant are strongly aromatic. Especially the sometimes
pungent aroma of the leaves is appreciated