Señor Al Pastor burger with onion strings | Photo by Nikki Buchanan  You’ve surely heard of Cold Beers & Cheeseburgers, the Arizona-based chain of neighborhood burger joints/sports bars dedicated to — you guessed it — cold beers and cheeseburgers. Well, Terry and Randy Bortin, brothers who have long been in the restaurant biz here in Phoenix, have put a fun Mexican spin on that simple, straightforward concept, opening Hamburguesas y Cervezas on First Avenue just...