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I have to say, I agree—-nothing beats El Farolito. And I've tried a lot of places in the Mission. Yelp agrees: http://www.yelp.com/biz/el-farolito-san-francisco-2

Papalote.

Hell yeah. Also, Cancun on 19th and mission.

Cancun also has an outpost on Market and 6th if you don't want to be drunk or make a special trip to the Mission.