What is the green stuff in my lobster? by Rian Alfiero | Mar 13, 2018 | 0 comments A What is the green stuff in my lobster? That is the tomalley, or liver of the lobster, and it’s delicious. If you are not a connoisseur of tomalley, simply rinse it off. Submit a Comment Cancel replyYour email address will not be published. Required fields are marked * Recipe Rating Recipe Rating Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.