Hidden behind a muraled exterior on 11th Street in South Philly is an unassuming taqueria, simply called “South Philly Barbacoa.” This restaurant, formerly a food truck, serves only two kinds of tacos. And they are perfection. The term “barbacoa” is where the U.S. term “Barbecue” comes from referring to slow cooked meats, often entire sheep or pigs, over an open fire. South Philly Barbacoa sticks with this tradition: their lamb tacos include the entire lamb and guests can request what piece of meat they want in their tacos (every piece is delicious, but the belly and face are generally the first to go). The barbacoa opens its doors at 5…