If you’ve ever cracked open a cooked lobster and noticed a strange green, creamy substance inside, you may have wondered what it was. That green material is called **tomalley**, and it is a normal part of the lobster’s anatomy. “Tomalley is essentially the lobster’s digestive gland,” scientifically known as the hepatopancreas. It helps with digestion, nutrient absorption, and storage. Its color can range from bright green to olive, yellow-green, or brownish green, while its texture may be smooth, creamy, or slightly grainy.

The green color comes from pigments and digestive materials connected to the lobster’s diet and natural body processes. Lobsters eat a variety of marine animals, including fish, mollusks, crustaceans, and worms. As their food is processed, these substances contribute to the distinctive color of the tomalley. The appearance can naturally vary from one lobster to another depending on its diet, condition, and other factors.

Tomalley is **not the same as lobster roe**. Tomalley is a digestive organ, while roe consists of eggs. If you open a female lobster and find bright orange or reddish material, you may be looking at roe rather than the green tomalley.

Some seafood lovers enjoy tomalley because it can taste rich, savory, buttery, and strongly like lobster. However, there are important safety concerns. Because the hepatopancreas can accumulate environmental contaminants, including certain marine biotoxins and pollutants, health authorities may advise people not to eat it in areas affected by contamination. The safest approach is to check current local seafood advisories before consuming tomalley.

So, the next time you see green material inside a lobster, don’t assume it means the lobster has spoiled. You’ve most likely found **tomalley—the lobster’s hepatopancreas**. It may look unusual, but it is simply one of the animal’s important digestive organs.