Kaffir lime
The plant is a  very thorny bush with aromatic leaves. The oil obtained from the rind of the fruit can be used as an insecticide. The plant is well suited to being grown in a container. The green fruits are different from other limes because of their bumpy and rough exterior. They are also quite small, about 4 centimetres across. The leaves are shaped like an hourglass. The leaves and the leaf-shaped stem are widely used in the cuisine of Cambodia, Thailand and Laos.