Heat a pot of water to boiling and add the lobster tails. Cook for 30 seconds. (Parboiling the tails allows the meat to be removed from the shell more easily).
Remove and let cool. Carefully use scissors to cut down the middle of the tail, being careful not to puncture the lobster flesh.
Carefully pull the shell outward and remove the flesh from the inside of the shell, trying to get it all in one piece.
Place the lobster tails in a vacuum seal bag (or ziplock freezer bag if using the water displacement method) with the butter, salt and tarragon. Seal the bag.
Place in the water bath and cook for 45 minutes.
Remove the bag from the water bath and take the tails out of the bag.
Serve the lobster drizzled with the bag juice (mostly butter and lobster sauce) with a squeeze of fresh lemon juice.
The extra sauce is great served over cooked pasta, rice or potatoes.
Notes
You’ll need to remove the lobster tails from the shells first before cooking them in the water bath.
I recommend parboiling the lobsters first so the delicate lobster meat can be easily removed from the shells.
Be careful not to leave the lobster tails in the water bath too much past the 45 minute cook time as they may start to get mushy.
When preparing your sealable bag for the water bath, it’s important that you remove the air as this keeps bacteria out of the bag.
The bag of lobster tails should be fully submerged in the water bath so they cook safely and properly. If the bag starts to float, you can open it, let the air out and reseal it.