Dinosaurs Of Eden is a children's book by Ken Ham. He is a young-Earth creationist, and his work is everything you could ever ask from a young-Earth creationist educational dinosaur book. If you're curious, I've got got a post concerning it over on my blog.
Oh, and the lemons? It's not stated specifically, but my guess is that in Eden, lemons were sweet. Which suggests that Ham believes that quinces were likewise edible -- but what do you suppose his position on pine cones is? I'll bet it's something surprising!