But now, during Sunday brunch, the restaurant is rolling out a new menu of tacos de guisados, the street-style tacos that incorporate stewed, braised or marinated meats. Each Sunday, they feature five or six out of a rotating selection of a dozen new tacos, so, for one day a week, the shrimp and fish are giving the spotlight over to pollo en mole, chicharrones en salsa verde and traditional cochinita pibil.
Sure, you could order one of these, or even a trio ($8). But go whole hog: get the sampler, a platter of five of that Sunday’s special tacos for $11. More than one person can eat? That depends on how hungry you are. These are petite street tacos, all double-wrapped for your protection in good corn tortillas, and although dinner might be a couple hours later than usual, you probably won’t feel like bursting.
When we stopped by this Sunday, just the second week for the new brunch items, the sampler included a potato and egg concoction, which Mariachi differentiates from the rest of Dallas by introducing the egg as a runny yolk, not an overcooked scramble. Next over on our plate was a taco featuring the simple, satisfying combination of tender, peppery-hot beef and smooth refried beans. Indeed, four of the five had refried beans, which are always a welcome contributor to a hearty taco.
They were most prominent, maybe, on the rajas and portobello taco, which tops the beans with roasted slices of poblano pepper and mushroom. This one’s a good place to reaffirm your faith in Mariachi’s fiery-hot and fire-engine-red chile de arbol salsa.

All five sampler tacos at a recent Tacos Mariachi Sunday. Bottom left: bistek and refried beans; bottom right: a more traditional breakfast taco with potato and egg.
Brian Reinhart
Not all of these match Tacos Mariachi’s very best regular menu items, but the bistek, mole and potato-egg tacos are surefire winners. And there are more Sunday brunch tacos to try some other week, when they’re available: the chicharron en salsa verde, pork marinated in a stew of pasilla chiles and rajas con crema. Combine those enticements with the restaurant’s one-day-only weekday specials, and it’s clear that Tacos Mariachi is the culinary version of Pokémon: You gotta catch ’em all.
Tacos Mariachi, 602 Singleton Blvd.