I bet there is one thing that you people do not know .I have been doing this for over 50 years and the lobsters come out perfect every time . It works on all lobsters , even 25 lb ones and larger . Try it. You will be amazed . The two tentacles that stick out from the lobsters head is mother natures perfect timers . Just take two lobsters about the same size and steam them according to your time table . About two minutes before one of them is done , grab the tentacle on one lobster and give it a tug . If it breaks loose from the lobster it is done . Take the lobster out and put it to one side on a plate .Then when yours is done , give the tentacle a tug , it should come loose also . You will find that no matter how big the lobster , the tentacle will break loose when the lobster is cooked all the way thru .You can not imagine how many restaurants serve lobster that is not cooked all the way thru . If the Tamale in the center is dark slimy green .the lobster is not cooked . The Tamale will be olive drab green and somewhat solid , not slimy . You will find that any lobster that is pulled out of the pot after the tentacle brakes loose with a tug it will be the most tender lobster you have ever eaten and the tail will also be tender not tough .