How to Make It
In a small saucepan, combine the butter, lemon zest, lemon juice and lemon thyme and melt the butter slowly over low heat. Season lightly with salt, cover and set aside.
In each of 2 large pots, bring 1 quart of water to a boil. Add 2 tablespoons of the salt and enough seaweed to each pot to form a bed that rises above the water. Arrange half of the lobsters in each pot on top of the seaweed. Cover and steam over high heat until the lobsters are bright red all over, 8 to 10 minutes.
Transfer the lobsters to a platter. Reheat the butter and discard the thyme sprigs. Serve the lobsters with the butter for dipping.