Cut salt pork into small dices and render in a sauce pan. Reserve the cracklings. Cook in the fat the onion thinly sliced until golden. Bring the water to a boil and cook potatoes, (peeled and cubed), for 10 minutes. Remove potatoes.add chopped clams and cook for 25 minutes. Then add milk, cracklings, potatoes, onion, butter, salt & pepper to taste. Serve in soup bowls with dot crackers.