I've never actually cooked it myself, but I eat it with gusto. King Taco in Los Angeles sold Lengua soft tacos that were absolutely worth killing a man to get your hands and teeth on one.
I often did my shopping at a converted Costco called "Vallarta Supermarket" in North Hollywood which backed up against the west fence of Burbank Airport at the SE corner of Sherman Way and Vineland. They have an extensive meat market there, catering more to mexican cooking than anything else. So as I recall, the packages of lengua were found in the same cooler alongside the fresh bull testicles.
You had to be a hairy-chested man to buy some of the things sold there.
