Just had my second lunch at Flying Pan Bistro on Clay near Kearny. Had a $4 bowl of hot and sour soup that is by far the best I have had in SF. It was actually both hot and sour, and chock full of preserved vegetables, tofu, other veggies, and delicious chuncks of pork. The spicing was perfect and I kept having great bursts of fresh pepper flavor.
Stupidly, I also ordered Zha Zhiang Mien (sp????). Stupid because I was full, not because of how it was. In fact, this dish was really good too, but I only had about 5 bites of it because the soup was so filling. A huge bowl of noodles came out topped with a very flavorful mixture of pork, peanuts (I think) and a bunch of other stuff. All for $7. I can report more after I eat my leftovers.
There is only one problem: no one was eathing there again. I think this might be a great new addition to Chinatown but it needs to stay in business. Hopefully the crowds will start coming.