How to Bake Pi: An Edible Exploration of the Mathematics of Mathematics

Some of the recipes looked good, but I think the connection to the maths was tenuous.
And I never really felt like I got what was promised. Cheng mentioned category theory a lot, but didn't so much talk about it. Other than saying "arrows", there was about no information conveyed. I was at least hoping for a refresher on Yoneda's Lemma, and didn't even get that.
Her explanation of some of the less advanced aspects of mathematics was good, her motivation of mathematics was excellent, so beginners may enjoy the early part of the book (as I did), but there wasn't enough organization or direction, and so we were never lead to a payoff.