For a lesson in "banh mi 101", visit this SoCal chainlet putting out countless iterations of "tasty, filling" Vietnamese sandwiches on "hot, fresh baguettes", plus smoothies in surprising flavors like avocado and "great iced coffee" that could "keep you awake for days"; there's "no ambiance" and the counter-style service can be "lacking", but "when you're hungry and on a budget, this is the...