YUM! My favorite Chinese in SFO is the PotSticker on Waverly IIRC in Chinatown. They have similar lunch specials.
Anyway, back to the Mongolian Beef. There's a place I frequent when I teach one evening a week in BKW (Beckley WV for those unfamiliar with our WV airline codes) that does Mongolian Beef like a Black Pepper Beef. Thin sliced peppers and onions and nice cuts of beef in a spicy sauce with lots of black pepper in it. It's not Mongolian beef by the standard... but I am addicted to their adaptation. It's very good (and spicy)!!