Yeah, it's busy. Yeah, real estate at the counter (bests seats in the house) can be tough to come by, particularly on Sunday, when people are stopping in before and after mass, on their way to work or just going home. The ladies working said counter won't take any shit, and they'll get pissed if you dither too long over the menu. But the Sunday-morning scene at El Taco de México is not to be missed, and the food that's served at this most authentic of Mexican diners is some of the best in the entire city. The menudo is an excellent hangover cure, and every taco is a work of short-order art. We brake for El Taco on Sunday morning — and you should, too.