In following the thread on Chinese Chicken Salad and its origins, I dug up this website (WARNING: It looks like yesterday's Chowhound.com):
If your eyes have recovered enough to read it, you'll see it asserts that while CCS was invented in LS, Chinese Lettuce Cups (Chinese Tacos, he calls them) were invented in SF. And that was pre-Dr. Atkins, yet.
I always assumed lettuce cups were a Hong Kong thing. Were they really invented in SF? By which restaurant? Who has them? Who likes them?