Falafel, the ubiquitous street food of the Middle East

Harissa is the red sauce used on falafels. (J.B. Forbes/St. Louis Post-Dispatch/TNS)
Sweet potato falafels, sprinkled with sesame seeds, are used to make a sandwich in a pita pocket, along with tomatoes, spinach and tahini sauce mixed with garlic and lemon juice. (J.B. Forbes/St. Louis Post-Dispatch/TNS)

I spent half of one youthful summer in the Middle East, working on an archaeological dig. Most weekends I went into the nearby town and gorged myself on the falafel sold by a local street vendor.