Umi. Umi's sustainably raised fish is filleted in house; it's uber-fresh and supremely tasty; the dressings and sauces homemade; the staff knowledgeable and friendly. Umi offers $9 Bento boxes that could be in the moderaely priced lunch category, but I have never been able to resist ordering a side of sashimi or one of their great appetizers.
Umi, 1328 18th Street, 355-1328, www.umisf.com.
Serpentine. This Slow Club relative is easy to forget due to its location, across Third Street, and that is a shame. You have to root for a place that prints its lunch menu daily. The kitchen offers such goodies as a fuyu persimmon salad with ginger-lime viaigrette ($8.50) and a flavorful Dungeness crab risotto with cara cara orange sections on top ($13.50).
Serpentine, 2495 Third Street, 252-2000, www.serpentinesf.com.