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I always recommend the RASA cookbooks. They're full of wonderful recipes and largely gluten-free, I think. (I don't think there are any recipes involving wheat, but if there are, there are only very few.) It depends on whether you like Keralan food, of course, but you can always go to RASA N16 and do a test tasting first. :)
'Fresh Flavours of India', the first one, has meat recipes in it, but enough vegetarian recipes (and some of his best) to make it worthwhile.
'The New Taste of India' is fully vegetarian.
The others listed on this page ...
http://rasarestaurants.co.uk/rasa_books.html
... are simplified recipes that aren't as good (especially as the others are fairly simple in the first place).
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I would recommend one of the Rasa cookbooks: http://www.rasarestaurants.com/UserPages/ViewBooks.aspx
Or this one is really good (not just veggie): http://www.ebay.co.uk/itm/like/252392131649?lpid=122&chn=ps&googleloc=1006886&poi=&campaignid=270621186&device=c&adgroupid=16885268106&rlsatarget=pla-146650308786&adtype=pla&crdt=0
Can anyone recommend a vegetarian curry cook book? I'd like to get one for a friend's birthday. She's also a celiac, so gluten free would be a bonus.