Matamoros Meat Market used to sell the best carnitas and barbacoa in the city, but you could only get them by the pound to go. Then they added the taqueria a few years ago, so now you can get your barbacoa or carnitas on a taco and then sit down and eat it. The dining area consists of six high tables furnished with barstools, and a long stainless steel counter that runs under the windows looking out on Washington Avenue. The carnitas taco comes on a hot flour tortilla smeared with refried beans and dotted with a little rice. The carnitas, which are pork chunks boiled in lard, are crispy on the edges and falling-apart tender in the middle. A taco costs $1.69, and the tortilla is so overstuffed, half of the filling falls out onto the aluminum foil. Luckily, plastic forks are provided. The barbacoa, or barbecued cow head, is sublime with green salsa, onions, cilantro and a squeeze of lime. Ask for the cheek meat.