although the most common product of the "citrus x hystrix" tree is its leaves (which give a sharp lime/neroli flavour to cambodian base paste known as krueng, thai dishes such as tom yum and indonesian food such as sayur assam - literally "sour vegetables"), the juice and rind of the small, dark-green gnarled fruit (known as jeruk obat - literally "medicine citrus") are used in traditional indonesian medicine.