Some people will literally eat anything that moves or doesn't move. Served dry and covered in hard and spiny armor, this isn't a snack you want to bite into. According to online accounts, you want to break off a leg and peel open the skin to get at the green colored meat inside. Hopefully, it won't regenerate in your stomach.
If you've never had the pleasure of eating river crab or sea urchin, probably the closest description of the starfish taste would be the way a beach smells at low tide. The texture is soft, moist, and mushy. It does not sound very appetizing. But that's how it is. It's no coincidence that sea urchin (which, again, tastes very similar) is considered an acquired taste. This is probably not going to be a favorite for everybody. For the seafood lovers out there, though, it's worth a try. It's a bit more expensive than a lot of street food.