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I've recommended it before here, but my favorite restaurant in SF is Fina Estampa, a wonderful Peruvian restaurant on Mission (a second branch opened recently -- I haven't eaten there).
Some of my favorites: a fabulous ceviche; parihuela (seafood soup, a wonderful meal); and a peasanty steak/onion/fried potato/peppers dish. The waiters are usually reliable, too -- if they recommend something, trust them.
Dave -