Taquerias are excellent at hiding. They’re often tucked away in ignored neighborhoods; they’re easily missed from your car or just outside of your peripheral vision. Azteca Taco House in Aldine, in unincorporated Harris County, along Houston’s northern border, is just as concealed, but that hasn’t stopped it from drawing long lines for its variety of guisados.I’ve visited five-year-old Azteca Taco House four times during the past year. The first time was a fluke, as the taqueria wasn’t on my trip’s itinerary. It was just a building that caught my eye while I was looking out the passenger window of my friend’s car. “Turn around,” I told him. “We need to go there.” I had a great feeling about the taqueria, which is set in a…