Portland's only Vietnamese sandwich drive-thru recently added Koi Fusion-inspired Viet tacos to the menu (three for $5), but don't order them—they're a trap; mediocre fillings on lousy tortillas in a plastic clamshell. Stick instead to the nigh-flawless banh mi ($2.25 each), especially the Saigon bacon, which can't be easily found elsewhere in the city, and the pretty excellent barbecue pork. Also available: sardines in tomato sauce, Vietnamese meatballs, headcheese, pâté and even a vegetarian combo.