For the budget-conscious person in Hanoi, there are no better alternatives to eating than traditional Vietnamese dishes found on every sidewalk, corner and alleyway. One needn’t look far. The food here is delicious, cheap and fun, as it requires a level of proactivity and interactivity that is unfamiliar to many cuisines worldwide. I say proactivity because the best places in Hanoi only serve one thing, and they only serve that one thing for a short window in the day. My favorite bun cha place is open for three hours a day at most, even less if they run out of food. So you must plan and run. Once you plop down on a dubious plastic cube, the interaction begins. Fix your plate with whatever…