Portland's food carts are no great secret — they're the golden idols of the cult of curbside lunch, and it can be difficult, amongst the great clamor of the rapidly opening and closing wheeled dispensaries, to sort the wheat from the chaff. It would be foolish to even try to name a single cart as the best, no-miss destination in all of Portland, but, amidst the great clamor, PDX 671 emerges as an example of a place that's doing everything right: a short menu of exciting new tastes, done incredibly well, for an eminently reasonable price, with a minimum of gimmickry. Their name is a marriage of Portland's airport code and Guam's area code, and in their food local ingredients meet island heat: Guam's flavors reflect influences from China, Japan, Mexico, the Philippines and Spain. There's heat, and sweetness, and smoke tumbling around in the grilled chopped chicken, and the soothing floury crispness of the naan-like flatbread; a whiff of coconut, the tang of garlic and vinegar…you could try to parse the interplay of flavor all afternoon. Or, you could pony up five dollars and simply enjoy an excellent lunch.