El Bolillo es muy delicioso! They make awesome tacos, aguas frescas (their machine broke down recently - so they currently don't have horchata, jamaica or agua de tamarindo). The owners are really nice! You get good service, the place is clean (ServSafe certified), and the prices are affordable.
Oh, and they just started making churros - yum yum!! And their posole is da Bomb - spicy spicy. ;)