When you crack open a lobster's body cavity, you'll see what looks like a bright green paste coating the tender white meat called tomalley, one of the lobster's internal organs.
Tomalley has an ultra-concentrated hit of lobster flavor and a buttery texture. However, the role it plays in a lobster's digestive system has health officials concerned.
Tomalley is an organ called the hepatopancreas, which filters toxins out of the lobster's blood. Some feel it has a faint metallic taste akin to the organ meat of other animals.
Tomalley from male lobsters is typically bright green, while tomalley from female lobsters has more of a yellow hue, as well as having a smoother texture.
If the lobster consumes any pollutants, they can build up in the hepatopancreas. Since they are non-water soluble, they won't release into the water as the lobster boils.