Roxanne Wilson and Loren Emerson's mobile purveyor of frybread has long been one of the best meals-on-wheels situations in town. Standing before its pink facade painted with cactuses, you can get a hot, chewy, simple, elegant frybread for $3. The Jazzy, an Indian taco made with little more than carne asada on frybread, has been a satisfying choice for years. This year, though, a new favorite entered the ring: a Navajo-style mutton sandwich. Tucked into fry bread with shreds of lamb leg and shards of Hatch chile, this sandwich has brought a new wave of customers to Emerson. Wash one down with a 32-ounce jar of iced prickly pear lemonade.