To play with the idea, I've come up with a few unique fast food concepts -- inspired appropriately by San Francisco -- to diversify the field. Offal promises to stay hot in the food world. Falafel is a fast food Americans outside of cities don't know or trust yet. I was thinking a restaurant serving both could be both excellent and successful. Chris Cosentino and the proprietors of Old Jerusalem would have to consult. I would call it Fal-off-All in honor of Chik-fil-A and serve lavash wraps stuffed with fried sweetbreads, kidneys, and liver.