Serpentine joins itself to the scene of San Francisco diners with aplomb, a lofty bare-bones space with exposed brick walls and concrete columns. Considering the lack of anything soft like carpet, drapes, or upholstery, the pleasant acoustics are practically a miracle. In the spacious bar, friends drink beers on aluminum stools at tall tables. The dining room is strictly industrial-diner, with only a few modern hanging light fixtures and votive candles to illuminate the black vinyl booths. There’s no other decor to speak of. The food is also unpretentious. A huge portion of savoury bread pudding with nettles, Swiss cheese, and onions comes with mixed greens and roasted carrots for only $11.50; the Prather Ranch burger boasts its own healthy heap of crispy, seasoned fries.