It’s impossible to miss Cornerstone Sonoma as it's nearly the only building along this otherwise quiet stretch. But housed within this charming outdoor marketplace is a kitchen brimming with ideas. To wit—beef tartare is ground to order and served on hash browns; while broccoli is grilled, then showered with puffed rice, Thai basil, and maple tahini. Thick, steakhouse-style onion rings arrive with a brilliantly crisp coating of potato flakes. This kitchen certainly does not limit itself to a single cuisine. Take, for example, the chicken fat-butter rice with Dungeness crab, which would fit right in at any Asian restaurant.Like its surrounds, the space is neutral yet breezy as can be, with an A-frame roof that reaches for the sky and sleek concrete floors.