Tacos El Gordo (San Diego)

Tijuana-style street tacos — adobada from the trompo, cabeza, lengua — served from a truck that draws lines of both locals and cross-border visitors at all hours. Smothered with fresh salsa and grilled onions, the adobada taco outperforms #8 Tacos El Güero with a 12-second carve-to-order speed, and each taco costs just $3.50, 25% cheaper than the average San Diego food truck offering.