Cooking guide
How Long to Cook Lobster
Lobster is the ultimate celebration shellfish — its deep, sweet, ocean-rich flavour needs almost nothing to shine. Boiling is the simplest and most reliable cooking method: heavily salted boiling water, a stunned lobster plunged in head-first, and careful timing by weight. Two signs tell you it is done: the shell transforms from blue-black to a vivid, uniform red, and the tail curls tightly under the body. Overcooking ruins lobster quickly, so precision matters.
- Stun in freezer 15 minutes
- Heavily salted boiling water
- Shell red, tail curled when done
Quick answer
Quick Answer
Heat through only
From boil return
From boil return
From boil return
Tail curls
~30 g per litre
Calculator
Lobster Cooking Time Calculator
Select the state and size of your lobster for an estimated cooking time.
Cooking temperature: heavily salted rolling boil. Start timing once the water returns to a full boil after adding the lobster.
These estimates assume a live lobster stunned in the freezer and plunged head-first into boiling water.
Preparation
How to Prepare Lobster Before Cooking
Live lobsters should be placed in the freezer for 15 minutes before cooking. This stuns them humanely and makes them inactive — important for safe handling since the claws can inflict serious injury. After 15 minutes, rinse the lobster under cold running water.
For the cooking water, season heavily: roughly 30 g of salt per litre of water is the standard — this mimics the salinity of seawater and seasons the meat from the inside out as it cooks. Add aromatics: bay leaves, black peppercorns, a squeezed lemon (add the halves too), and thyme. A glass of dry white wine adds complexity. Bring everything to a vigorous rolling boil before the lobster goes in.
For frozen pre-cooked lobster, thaw overnight in the refrigerator or under cold running water. It needs only 2 to 3 minutes to heat through — never cook it as long as a live one.
Method
How to Cook Lobster Step by Step
- Place live lobster in the freezer for 15 minutes. Rinse under cold water.
- Fill a large stockpot with water. Add salt (30 g per litre), bay leaves, peppercorns, halved lemon, and thyme.
- Bring to a vigorous rolling boil over high heat.
- Grip the stunned lobster from behind and plunge it head-first into the boiling water.
- Cover the pot and wait for the water to return to a full boil. Start timing from that moment.
- Cook: small (400–600 g) 12 to 15 minutes; medium (700 g–1 kg) 15 to 20 minutes; large (1 kg+) 20 to 25 minutes.
- For frozen pre-cooked lobster: cook 2 to 3 minutes to heat through only.
- Remove the lobster from the water. Allow to rest 5 minutes.
- Split lengthwise with a sharp knife. Remove the claws and serve with melted garlic butter.
Cooking chart
Lobster Cooking Time Chart
| State | Size | Time | Notes |
|---|---|---|---|
| Frozen (pre-cooked) | Any | 2 to 3 minutes | Heat through only; already cooked. |
| Live | Small (400–600 g) | 12 to 15 minutes | From the moment the water returns to a boil. |
| Live | Medium (700 g–1 kg) | 15 to 20 minutes | From the moment the water returns to a boil. |
| Live | Large (over 1 kg) | 20 to 25 minutes | From the moment the water returns to a boil. |
Doneness
How to Know When Lobster Is Done
Two visual cues confirm a cooked lobster: the shell has turned uniformly bright red with no blue, grey, or black areas remaining; and the tail has curled tightly under the body. For additional confirmation, pull an antenna — it should come away easily. Crack a claw and check the meat: it should be white and opaque throughout, not translucent. Overcooked lobster becomes dry and fibrous; check at the lower end of the time range and add minutes only if needed.
Safety note: lobster must be fully cooked. The tail and claw meat should be completely white and opaque. Never eat undercooked shellfish.
Seasoning
Best Seasonings for Lobster
Lobster has such an exceptional flavour that minimal seasoning is the right approach. The cooking water should be heavily salted with aromatics, but the meat itself needs only melted butter, lemon, and perhaps a little garlic to reach perfection. Classic accompaniments include garlic butter, drawn butter, tarragon mayonnaise, and hollandaise. For a more festive preparation, lobster meat is extraordinary in a bisque made from the shells, or tossed through pasta with cream, cognac, and coral.
Avoid this
Common Mistakes
- Starting in cold water — always plunge live lobster into already-boiling water.
- Under-seasoning the cooking water — use heavily salted water, like the sea.
- Overcooking — lobster dries out rapidly past doneness; use the time chart strictly.
- Reheating frozen lobster too long — pre-cooked frozen lobster needs only 2 to 3 minutes.
- Not resting before serving — a 5-minute rest allows the meat to firm slightly and the shells to cool enough to handle safely.
Serving
What to Serve With Cooked Lobster
Serve the lobster split lengthwise on a large plate with the claws detached. Provide claw crackers, picks, a ramekin of melted garlic butter, lemon wedges, and plenty of napkins. A chilled glass of white Burgundy, Chablis, or a good Champagne is the ideal pairing. For a more filling meal, serve alongside crusty bread, potato salad, or a simple green salad. The tomalley (the green liver) and the coral (the pink roe in females) are considered delicacies by many — rich and intensely flavoured.
Recipe ideas
Lobster Recipe Ideas
- Lobster with garlic butterSplit boiled lobster, brush with melted garlic butter, finish under the grill for 2 to 3 minutes.
- Lobster bisqueRoast the shells in butter, deglaze with cognac and wine, add cream and stock, blend until silky.
- Lobster pastaToss picked lobster meat through tagliatelle with cream, tarragon, and a touch of brandy.
- Lobster rollFold chilled lobster meat with light mayonnaise, celery, and chives into a buttered brioche roll.
Leftovers
Storing and Reheating Cooked Lobster
Cooked lobster keeps refrigerated for up to 2 days in the shell, or 1 day if picked. Reheat gently in butter in a pan over low heat — never boil again. The shells freeze well for making stock or bisque. Picked meat freezes for up to 1 month; use in pasta, bisque, or lobster rolls after freezing.
Tools
Useful Tools for Cooking Lobster
- Large stockpotMust be big enough to fully submerge the lobster in boiling water.
- TongsFor safely lowering and lifting the hot lobster.
- Claw crackersEssential for breaking the claws to extract the prized claw meat.
- Sharp chef’s knifeFor splitting the body lengthwise after cooking.
Questions
FAQ
How long does lobster take to cook?
Live lobster takes 12 to 25 minutes depending on size. Small lobsters (400–600 g) need 12 to 15 minutes; medium (700 g–1 kg) need 15 to 20 minutes; large (over 1 kg) need 20 to 25 minutes. Pre-cooked frozen lobster needs only 2 to 3 minutes to heat through. Time from the moment the water returns to a full boil after adding the lobster.
How do you know when lobster is fully cooked?
Two clear signs: the shell is uniformly bright red with no blue or dark patches, and the tail has curled tightly under the body. Pull an antenna — it should come away easily. Crack a claw; the meat inside should be completely white and opaque. If still translucent, cook for 2 more minutes and check again.
Should you put lobster in cold or boiling water?
Always plunge lobster into already-boiling water. Starting in cold water causes the lobster to shed its claws, produces a waterlogged texture in the meat, and extends the lobster’s stress time. Bring the water to a vigorous, heavily salted boil before the lobster enters the pot.
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