Bring water and salt to a boil in a 5-gallon stockpot. Add lobsters. Cover and cook 12 minutes or until shells are bright orange-red and tails are curled.
Note: Four 1 1/2-pound lobsters yield about four cups of cooked lobster meat. Most of the lobsters we used were between 1 1/4 pounds and 1 1/2 pounds. If you can't get or don't want to use live lobsters, use frozen tails. Six six-ounce tails, which you should steam for eight minutes, yield about two cups cooked meat.