Fill a large pot with a lid with water. Squeeze the juice of 1 lemon into the water, then toss the lemon halves and sea salt into the pot. Bring the water to a boil.
Place the lobsters in the pot, cover and boil over medium heat until the shells turn bright red, about 8 minutes.
Meanwhile, prepare an ice bath for the lobsters.
Remove the lobsters from the pot with tongs and shock in the ice bath.
To remove the meat from the lobster shells, cut a slit vertically down the shell using a kitchen knife.
Remove the meat from the lobster shells. Roughly chop the lobster meat.