If you're anywhere near the Outer Richmond at lunchtime, chances are you're articulated extremities will feel as frosty as Otter Pops. Understandably, cold fish is a hard sell. But, suggests SF Weekly restaurant critic Meredith Brody, the sushi here is so good you might not care. Go for the toro and scallop nigiri, with a bowl of clam miso soup. You know, just to keep your body temperature up. Yu Zen, 4036 Balboa (at 41st Ave,), 386-9800.