Stew: Kale and Clam

America is full of people who have come here to escape persecution or simply to make a living. The descendants of many Portuguese sailors and fishermen still live in Provincetown, Massachusetts, and make foods based on Portuguese originals. This hearty soup is a delicious example.

Fortunately, both kale and clams are at their best in cold weather, just when I am tempted to cook pork. I originally made this version after I had baked a ham. I generally start a ham by gently poaching i