Definitely off the beaten path, Nena's restaurant is located in the deep Mission out by Cortland. This is the place in San Francisco for Pupusas. You get a choice of beans, cheese and pork and can get any combination of these ingredients. Occasionally, there are zucchini pupusas. In case you are wondering, a pupusa is filling wrapped in the same dough they make homemade corn tortillas from and then grilled. What you get is a round pocket full of deliciousness. Enjoy!