"dolphin flesh and blood" refers to the big bones of pigs and the meat bones of various parts of pigs, not the meat of a special part.

"dolphin" means "pig" in classical Chinese and Japanese, so "dolphin flesh" actually means "pig flesh".

Now dolphin bones are usually served in Japanese restaurants. Dolphin bones are generally used to make noodle soup with dolphin bones, and Japanese-style dolphin bone Lamian Noodles is made of dolphin bone soup made of pig bones and various vegetables after a long period of boiling. In China, most soups for cooking noodles and rice noodles are made of pig bones or mutton bones and boiled in a pot with water for a long time, but generally it is not named "pig bone noodles/noodles" in China. ?