I don't think I've had them before, but have tried them at three different Japanese restaurants in the last week. They are small green mild peppers, roasted with soy sauce and topped with bonito shavings. And I am now addicted! Is anyone else eating them too? And where?
Beacon (Culver City): lightly roasted with lots of sauce (soy and ponzu, I think) and lots of bonito, I liked these the best so far.
Sushi Karen (Culver City): over-roasted, but they removed the stems, so it's even easier to pop in your mouth. A little greasy, bonito shaved a little heavy.
Shaab (Pasadena): lightly roasted, a bit greasy.