Tandoori in the Tenderloin is for novices – SF foodies queue for the bright, clean flavors of Udupi's South Indian dosa (light, crispy lentil-flour pancake) dipped in sambar (vegetable stew) and coconut chutney. Marathoners may need help finishing two-foot-long paper dosa – save room for pea and onion utthappam (lentil-flour pancake) or bagala bhath (yogurt rice with nutty toasted mustard seeds).