I will spend 3 days in SF, in the Union Sq area. I am looking for more or less affordable (say, < $30 per person without alcohol) places with GREAT food. seedy neighborhoods, not fancy locations, lack of ambiance, iffy service... are just fine, as long as the FOOD is excellent. relatively close to Union Sq is a plus but not a must. Any type of food will do. I'd love to go where the locals go FOR FOOD.