Many of the most popular taco styles have long, rich, little-known histories. Explore some of them in this eye-opening, mouth-watering food adventure.

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Every time barbacoa is prepared, it starts in the same place: a big hole in the ground. It doesn’t get much more humble -- or delicious -- than that.
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Savory, pork-based al pastor tacos are a street-food staple of Mexico City. But they actually have origins that stem back to ancient Asia Minor.