3/4 c. plain nonfat yogurt
1/4 c. mayonnaise
1 tsp. creamed horseradish
2 tsp. prepared mustard
3 c. cubed cooked potatoes
1/2 c. sliced celery
1/2 c. diced onion
6 hard cooked eggs, quartered
1/4 c. diced pimento
Salt and pepper to taste

In large bowl, combine yogurt, mayonnaise, mustard, and horseradish. Add remaining ingredients, toss to mix. Refrigerate to blend flavors.