Norsk Ertesuppe (Norwegian Split Pea Soup)

1 pound green or yellow split peas

2 quarts boiling water

1/4 pound lean salt pork (in one piece)

1 large carrot, diced

1 large stalk celery, including leaves, diced

5 green oinions, including tops, sliced

2 tsp. salt (varies with saltiness of pork)

1/4 tsp. pepper

Sort peas. Place in boiling water in large heavy kettle over moderate heat; add salt pork. Cover and simmer about 1-1/2 hours. Add remaining ingredients; cover and simmer, stirring occasionally, 1 to 1-1/2 hours or until quite thick (about the consistency of gravy). Add salt if desired.