4 small baking potatoes, sweet potatoes or yams
2 dozen clams in the shell (preferably cherrystones)
4 ears fresh corn
2 (2 1/2 pound) broiler-fryer chickens, quartered
1/2 pound butter or margarine
2 (1 pound) live Maine lobsters*
4 small onions, peeled
Rockweed or cornhusks
* NOTE: To prepare lobster before adding to kettle, lay each lobster on wooden board. To sever spinal cord, insert point of knife through back shell where body and tail of lobster come together. Turn lobster over. With sharp knife, split body of lobster down middle, cutting through thin undershell just to back shell and leaving back shell intact. Discard dark intestinal vein running down center of lobster; also discard small sac below head. Crack large claws.
Scrub potatoes. Scrub clam shells under cold running water, using a stiff brush to remove dirt and sand. Place clams in a large bowl; add cold water to cover and let stand 30 minutes. Meanwhile, use scissors to trim off tops of ears of corn. Remove a few outer husks from each ear and reserve. Turn back remaining husks; remove and discard silk. Replace husks as they were. Soak ears and reserved husks in lightly salted water until you are ready to cook the corn.