Ali Baba is a little middle-eastern fast food type restaurant in the industrial part of South San Francisco. You order at the front, then wait for your number to be called to get your food. There are a variety of lunch specials, including falafel sandwiches, chicken and lamb shwarma, kebabs, salads, hummous, pitas, etc. The amount of food is quite generous too and of good quality. I was impressed by the plate of kofte kebab (spiced ground meat shaped into balls and grilled), lentil rice, and side salads.
The place is pretty busy at lunch, so it may be difficult to find parking nearby.