Mormon Split Pea Soup

Ingredients

2 tablespoons butter
1 cup onion
2 cups split peas washed
3 quarts water
3 potatoes
1/2 teaspoon marjoram
2 teaspoons salt
1/4 teaspoon pepper
1/2 cup celery

Instructions

In a heavy 5 to 6 quart casserole, melt butter over medium heat. Add onions and celery. Cook 5 minutes until soft, not brown. Stir in split peas and water. Bring to a boil. Skim off any scum that may form. Add potatoes, marjoram, salt and pepper. Cook about 1 1/2 hours.