Taqueria los Barrilitos
Time Out says
Just down the street from La Chaparitta is perhaps the city’s best al pastor taqueria (making this stretch of 25th Street the beating heart of Chicago’s taco scene). An enormous spit of rotating marinated pork beckons you as you walk in, and fortunately Los Barrilitos knows how to treat it right, slicing the chile-stained pork directly onto awaiting tortillas. Tender, with nicely caramelized edges, this is al pastor done right.