If you'd have grown up in the Yucatan you'd have been lucky enough to have been eating this food all your life. It's fast food made by Grandma. It might literally be in Granny's living room. The construction workers take out from here. The rich folks in the suburbs send their maids out to collect food from these places. And you can wander in to one and pretty much bet on having your best food experience in Merida. They generally offer 3 or 4 dishes per day.
I go to a place that I don't remember the name of on calle 54 between 39 and 41 on the right side of the street.
see Lorna Gails recommendations here
all of my neighbors rave about Tio Will. I've got to go before we sell the house.