You might have seen okonomiyaki on a restaurant menu here or there around town. It's not impossible to find but it's also not the most common of Japanese dishes. Essentially it's a savory pancake that -- at least in Japan -- you can customize yourself with toppings and sauces. In fact, there are whole restaurants dedicated to the art.
Here in the Valley you're more likely to get a pancake that's designed to the chef's standard but usually includes toppings such as pork, shrimp, squid, cabbage, Japanese mayo, and okonomiyaki (it's similar to Worcestershire sauce). The pancake is grilled till crisp on the outside and served with a layer of bonito flakes, which dance around the dish as your hot plate of food is delivered to your table.