It's so central that it way easy to stop in Nopalito (NoPA) for a quick Quesadilla de Repollitos $13.00 (Masienda blue corn tortilla, sautéed brussels sprouts, onions, cascabel-guajillo chile oil, jack cheese, queso fresco and salsa macha.) A perfect agua fresca and grab a place outside. Especially great when it's sunny. My kids love the Pozole Rojo $15.00 Soup of pork shoulder, hominy, ancho chile, radish, cabbage, lime, onion, oregano, and tortilla chips. Always fresh.
Sumac is a gem—Turkish street food on the go in Russian Hill. I love any of their bowls or wraps! Also, the roasted potatoes with carrot labne and warm pita. And as a special treat, try the homemade baklava.
Sometimes the only thing that works is The Bird. Gluten-free, deep-fried (always free-range) chicken sandwiches with apple slaw are legit. On New Montgomery in SOMA, They are now also in Hayes Valley.
When I'm out in the Outer Richmond, I stop by Seakor Polish Deli and pick up pierogi, kielbasa, and some sauerkraut. And drive right home to cook them and have them in the garden—such a nice break.