What's The Green Stuff In My Lobster And Can I Eat It? - Chowhound

Lobster tomalley is actually an organ called the hepatopancreas. It is also found in other crustaceans, most notably crabs, in which it is sometimes called "mustard". The hepatopancreas essentially functions as a combined liver and pancreas. It filters toxins out of the lobster's blood, which, as you'll see, has raised concerns about eating it. Some people also find that tomalley has a faint metallic taste akin…