Though Houston is becoming increasingly known for its gourmet food trucks, it's the classic trucks that boast the best values and some of the best food. Taco Keto has been serving the same corner of Cullen Boulevard in the Sixth Ward for years, and it doesn't need to innovate with crazy ingredients or over-the-top preparation. It makes do with simple corn tortillas bathed in roasted guajillo chile sauce before being tossed on the hot griddle and topped with your choice of meat. Each taco is served with a side of sautéed onions and potatoes and a roasted jalapeño with a generous sprinkle of cilantro. One taco with all the sides and fixings is only $1.50, so try not to go overboard and order a dozen. After one bite, you'll be tempted.