Preheat the broiler, and place the rack about 6 inches away from the heat source. Using kitchen scissors, cut the top of the shell down the middle and spread open the shell a bit to expose the meat (this might be easy or hard, depending on how attached the meat is to the shell – it’s all fine).
In a small bowl melt the butter with the garlic and salt. Brush the tops of the lobster tails with the butter mixture. Broil for about 6 minutes until the meat is firm and opaque (white) and an instant read thermometer registers 140°F in the center of the tail.