Put 2 inches of salted water in the bottom of the pot. (You want the salinity to be roughly equal to the sea.) Set a steamer rack inside and bring the water to a rolling boil over high heat. Add the live lobsters one at a time, cover the pot, and start timing (see the table below). Halfway through, lift the lid (careful—the steam is hot) and shift the lobsters around so they cook evenly. Shell the lobsters and arrange the meat on a New Year’s Eve–worthy platter, wedding china encouraged, but not required.