Monica Eng has a nice Ashland Ave. taco throwdown review on The Stew She ends the piece by talking about how some reader wrote her an unpleasant note about Carnicera Leon being “grubby” last time she wrote about it. This time Eng writes a disclaimer saying that Carniceria Leon isn’t the spot to go to if you’re looking for fancy surroundings….I’m willing to bet the reader who wrote her the note didn’t even get the taco, because if she had, she’s have written a note thanking Monica for sending her to one of the best Tacos Al Pastor in Chicago. Sure, the outside of Carniceria Leon (1402 N. Ashland) looks like a cross between a prison and a convenience store, but the grime inside is honest and neccessary, basically the kind of carbon streaking and “seasoning” a spot needs to yield special tacos.