Filipino food. San Diego, specifically National City has very good Filipino food and has had it back before gaslamp had tourists and yet nobody I personally know or heard of visits for the Filipino food. It's not just San Diego as well as I know some very good Filipino restaurants in Las Vegas and Los Angeles I frequent that are also under appreciated by non-Filipinos. Part of the reason I suspect is that Filipino food visually looks un-appetizing as well as has flavor profiles that may be too different for people to give it a chance but this doesn't change the fact that we have a culinary food scene that we can identify with San Diego while also knowing it's easily in the top 5 of a cuisine type. Oddly enough I have never seen a upscale Filipino restaurant ever nor a Filipino food truck except for I think a Filipino fusion in NYC.