Sour Cream Potato Salad

Source: About.com

6 medium potatoes, about 2 pounds 
1/2 cup finely chopped cooked ham 
1/2 cup chopped onion 
1/2 cup chopped green bell pepper 
1/4 cup chopped celery 
1 tablespoon butter or margarine 
3/4 cup sour cream 
3 tablespoons vinegar 
1 teaspoon salt 
1/4 teaspoon pepper 

Cook potatoes, covered, in boiling salted water for 25 to 30 minutes or just until tender, Peel and slice potatoes to make about 6 cups. Meanwhile, in a large skillet cook ham, onion, green pepper, and celery in butter or margarine until tender; drain off fat. Stir in sour cream, vinegar, salt, and pepper. Heat through but do not boil. Combine sour cream mixture and potatoes in a large serving bowl. Serve potato salad right away.
Sour cream potato salad serves 8.