Cod Sperm. Have you ever eaten it?
 

Cod Sperm is called shirako in Japanese. It is male counterpart of caviar. Caviar are fish eggs, shirako is a cod sperm sac. It has a creamy taste and custard like consistency. Best-eaten pan-fried, steamed or deep-fried. Just don’t think about what you are eating to enjoy the taste.

What do you think about the taste?

http://thealpaca.hubpages.com/_21read/hub/Five-things-you-do-not-know-about-Japanese-Food