Good books on vegetarianism for 9 yr old?

[Comtessa]

My nephew is considering becoming a vegetarian, and I'm his only vegetarian family member, so he came to me for advice!   I told him he'd have to learn to eat more vegetables.   But really, I think he's serious about it and I want to encourage him.  His mother is supportive but I'm not sure his father would be (he's an avid hunter, among other things). 

I'd love to give him a book on vegetarianism as a Christmas present.  Any suggestions for something age-appropriate for a 4th grader?  Something that gives lots of supportive, fun advice would be best.

[catnip]

Herb the Vegetarian Dragon and the cookbook that goes with it are great.