The bright green substance found inside the body cavity of a lobster is called tomalley. Biologically speaking, it is the lobster’s hepatopancreas—an organ that functions as both its liver and its pancreas.
As the digestive organ, the tomalley filters and processes the lobster’s food. Far from being waste, it is highly prized in the culinary world. It boasts a rich, concentrated, and intensely briny flavor that captures the very essence of the ocean. Because of its creamy texture and deep flavor profile, it is considered a true delicacy by seafood aficionados and is frequently used to elevate sauces and soups.
Don’t Confuse It with the “Other” Green Stuff (Roe)
When cracking open a female lobster, you might actually encounter two different green substances. It is important to know the difference between them:
Tomalley: This is the smooth, pasty digestive organ (the hepatopancreas). It has a rich, savory, and deeply briny flavor.
Fish & Seafood
Roe: Also known as coral, this is the female lobster’s unfertilized eggs. Roe has a distinct granular, caviar-like texture and offers a slightly sweeter, more delicate briny flavor.
