If you're focused on your driving while tooling down 16th Street (and you should be), you may miss the two food trucks camped out near Monroe Street. But the next time you're not rushing to get somewhere, stop and experience some of the best Mexican food in town. La Frontera #1 faces 16th Street, and the cash-only joint serves up tacos, burritos, vampiros, tostadas, and more. The al pastor is to die for and we usually order it packed into a burrito, but with a long list of available meats, including carne asada, cabeza (beef head), and buche (pork stomach), it'll be a long time before we run out of things to try. And speaking of options, you can take your food to go or enjoy it under the awning of the small seating area, or you can check out La Frontera #3, the food truck with a more seafood-heavy menu located in the same parking lot.