We Cracked Open Our Lobster for Dinner and Found This Strange Green Substance Inside—What It Actually Is May Surprise You.

The discovery of tomalley has become a frequent topic on social media, where photos of green-filled lobsters often generate thousands of comments. Some users mistakenly believe it is mold, algae, parasites, or spoiled meat, while others quickly reassure them that it is completely normal.

Another common point of confusion involves lobster roe.

Female lobsters may contain small eggs inside their bodies. Before cooking, these eggs are usually very dark—often black or deep green. After cooking, they typically turn bright red. Like tomalley, lobster roe is considered edible by many people and is even regarded as a delicacy in some cuisines.

Knowing the difference between normal anatomy and signs of spoilage can help you prepare seafood with greater confidence.

Fresh lobster meat should be firm, moist, and have a clean ocean smell. A mild seafood aroma is perfectly normal.

However, there are situations when you should avoid eating a lobster.

If the meat has a strong ammonia odor, an unpleasant sour smell, or appears unusually slimy, these may be signs that it has spoiled. Likewise, if the shell was badly damaged before cooking or the lobster had been dead for an extended period before preparation, its quality and safety may be affected.

Proper storage also plays an important role.

Fresh live lobsters should be kept cool and cooked as soon as reasonably possible after purchase. Cooked lobster should be refrigerated promptly and consumed within the recommended storage period to maintain freshness and reduce the risk of foodborne illness.

When preparing lobster at home, many cooks choose to remove the tomalley simply because they prefer the taste of the white meat. Others save it to use in sauces or seafood dishes. Neither approach is unusual.

If you’re uncertain about any part of a lobster after opening it, it’s always best to rely on trusted food safety guidance rather than internet rumors. Seafood experts and local health authorities can provide recommendations based on current information and regional conditions.

One reason photos like these spread so quickly online is that they trigger our natural curiosity. Anything unexpected inside food can seem alarming at first glance, especially if we’ve never seen it before. But not every unusual color or texture indicates a problem.

In fact, learning about the natural anatomy of seafood can make cooking much less intimidating.

Lobsters have several internal organs that look very different from the neatly packaged seafood sold in grocery stores. Once you understand what each part is, preparing a whole lobster becomes much easier and far less surprising.

The green tomalley is one of those features that often catches first-time cooks off guard. While its appearance may seem unusual, it is generally a normal part of the lobster’s body rather than a sign that the seafood has spoiled.

That said, everyone has different comfort levels when it comes to eating certain parts of shellfish. If the appearance makes you uncomfortable, there’s nothing wrong with removing the tomalley and enjoying only the tail, claw, and knuckle meat.

Ultimately, the best approach is to purchase seafood from reputable suppliers, store it properly, cook it thoroughly, and follow current food safety recommendations in your area.