3/4 c. chopped onion
1/4 c. lemon juice
1 tbsp. salt
1/2 tsp. dry mustard
1/4 tsp. pepper
4 lbs. potatoes, boiled in jackets, peeled & cubed
1 1/2 c. celery
2 c. Miracle Whip

Stir together onion, lemon juice, salt, mustard and pepper. Pour over hot potatoes tossing to coat evenly. Cover and refrigerate 1 hour. Stir in celery and Miracle Whip. Chill. Makes 10 (1 cup) servings.