I had sea cucumber for the first time the other night (along with 鮟肝 (ankimo - monkfish liver). Sea cucumber flavor was fine but texture wasn’t my favorite (I also don’t like crunching on cartelige). Ankimo was smooth and delicious. Shiokara is also great. Shirako (your fish jizz) is great battered and fried, but I’ve never had the guts to try it raw.