OK before you get all grossed out about eating raw sea urchin when it's fresh it's really good. The divers got two dive bags full of sea urchins which at a sushi bar would be called "Uni". It really should only be eaten when "fresh fresh", (in my opinion) and if your not near the ocean then it's not going to be fresh. It's very much like butter, very rich and can't be eaten alone. Would you take a big bite out of a stick of butter? The top photo is Uni in the shell with some vinegar and soy sauce and sake. Photo on the left is what the uni looks like when package for shipping.