One of my favorite San Francisco restaurants is not really a restaurant at all. Every Thursday and Saturday evening at 6 p.m., Mission Street Food, a non-profit organization, takes over the unassuming Lung Shan Chinese Restaurant and hosts a guest chef who prepares affordable, small-plate dishes that have foodies and hipsters lined up around the block. Profits are donated to charities, mostly to feed the hungry. The Single Guy recently reposted a review of his experience at the spot.