Butterflying your lobster tails allows you to add extra seasoning to the meat as it cooks, helps it to cook more evenly, and allows for a pretty presentation.  Use some sharp scissors to make a cut down the middle of the shell lengthwise. Be careful not to drop any bits of shell onto your meat. Use a spoon to separate the meat from the shell on the underside. From here you have two options: You can cook the meat inside the shell or you can remove it, place the shell back together and put the meat on top of the shell.