KAFFIR LIME, KIEFFER LIME, MAKRUT, MAGROOD: A medium sized tree with large hourglass shaped leaves and small (1-2″ diameter), hard, knobby green fruit. From Southeast Asia.
The leaves (used dried, fresh or frozen) and zest of the fruit are used very commonly in Thai and other Southeast Asian cuisines for its sharp lime/neroli flavor. The fruit, juice, and rind (jeruk obat “medicine citrus”) is used in traditional Indonesian medicine.
The name “kaffir” is considered to be a racial slur in Africa (referring to the native peoples there) and as a Muslim religious term meaning “infidel.”