2 potatoes
1 sweet potato
4 hard boiled eggs, chopped
1 stalk celery, chopped
1/2 red onion, chopped
3/4 cup mayonnaise
1 tablespoon prepared mustard
1 teaspoon salt
1 1/2 teaspoons ground black pepper

Bring a large pot of salted water to a boil. Add potatoes and cook until tender but still firm, about 30 minutes. Drain, cool, peel and chop.

Combine the potatoes, eggs, celery and onion.  Whisk together the mayonnaise, mustard, salt and pepper. Add to potato mixture, toss to coat. Refrigerate and serve chilled.