The average American consumes more than eight pounds of avocado per year. A new book traces the history of the avocado, from a humble dooryard tree in Mexico to a global superfood phenomenon By Sarah Allaback and Monique F. Parsons We grew up in a small Southern California town where avocados covered the hillsides. When we went East for college in the 80s, we couldn’t find good avocados anywhere. Now Americans eat close to three billion a year, and the avocado has become a familiar sight ac...