says

Curries encompass an infinite array of complex dishes, all carefully balancing sour, salty, sweet, pungent, bitter, and umami. Raghavan Iyer demonstrates just how different one curry can be from another in his spicy introduction to Indian flavors.

from the publisher

660 Curries is the gateway to the world of Indian cooking, demystifying one of the world's great cuisines. Presented by the IACP award–winning Cooking Teacher of the Year (2004), Raghavan Iyer, 660 Curries is a joyous food-lover's extravaganza. Mr. Iyer first grounds us in the building blocks of Indian flavors...then, from this basic palette, he unveils an infinite art.