I had this at Sha Bistro and see they have it at a bunch of other Shanghai places in Fremont and Milpitas. It's very good, a light fried spherical puff that's airier, chewier, and more flavorful than fried tofu. Menu listings include:
Does this actually have gluten in it? From the two garbled English-language recipes I find online it sounds like it might actually be 100% fish and named that because the texture is reminiscent of wheat gluten.