Taquería El Paisa

This Oakland institution is widely hailed as the temple of tacos. It is strictly no fuss—no air-conditioning—and no service–order at the counter—but after one bite of their juicy meat, dripping with so much savory goodness that the yellow corn tortillas are doubled up, and it's all worth it. Meat is given the star treatment here, and offal, including tripe and cabeza, are of special note. The suadero, a beef-based, carnitas-style taco, and the seared, crumbled chorizo taco with a distinct smoky flavor, exceed expectations. Good things come in threes, so order another—tender and flavorful carnitas is a sure thing. 
There is a wide selection of aguas frescas ranging from guava and passion fruit to carrot, or go for the old standby—Mexican Coca-Cola.