This is a very good book which covers many popular ingredients in Indian cookery. It has sections for spices, herbs, fruits and vegetables (this section is quite limited), nuts, dals and pulses, cereals and flours and miscellaneous ingredients (such as jaggery and rose essence). For each ingredient there are details on how it grows or is manufactured, appearance and taste, buying and storing, medicinal and other uses and culinary uses. Then there are two recipes, at least one of which is vegetarian (except for star anise where both the recipes are meaty).
The author has attempted to provide recipes for regional dishes, which may be less well-known to non-Indian readers. To me, it seems that some of these regional recipes many not necessarily be particularly authentic or orthodox. For instance, the idli recipe contains more urad dal than rice, which is not how I would make it and certainly I have not seen idlis made that way before. However, it is a good effort, and, as the author says at the start of the book, there is very rarely only one way of doing things in India, so there are many different ways of making a dish.
What is most significant about this book is that it doesn't just tell you a few quick things about an ingredient and then go straight to a recipe. It attempts to explain the ingredients place in Indian culture in terms of how they are used in cookery and also in other areas. This is really important, as food is about so much more than just taste in India. Medicinal or health promoting qualities, spiritual significance and symbolism are also important factors.
For anyone who wants to learn more about the basic ingredients of Indian cookery and how they are used, this is a brilliant book. It doesn't cover everything, but it's a very good start, and there are many recipes for you to enjoy as you learn.