Curry is one of the most widely used--and misused--terms in the culinary lexicon. Outside of India, the word curry is often used as a catchall to describe any Indian dish or Indian food in general, yet Indians rarely use it to describe their own cuisine. Curry answers the question, "What is curry?" by giving a lively historical and descriptive account of a dish that has many incarnations. In this global history, food writer Colleen...