In empty lots and street corners through out Tucson the ubiquitous hot dog cart with a picnic table, awning and Norteno music blaring signals a delicious repast. The Sonoran Hot Dog. BK's in south Tucson creates one of the best and is hopping with activity from opening to close. The dog is a thin all beef frankfurter wrapped in bacon and then sauted and served on a fresh doughy Mexican bun....