1/2 c. mayonnaise
1/3 c. milk
1 tbsp. prepared mustard
1/2 tsp. salt, or to taste
1/4 tsp. pepper, or to taste
3 c., diced cooked potatoes (2 lg.)
2 c. cooked, fresh or drained canned cut green beans (8 oz.)
1 c. sliced celery
1/2 c. thinly sliced green onions
Romaine lettuce (optional)
For garnish: Roasted red pepper or pimento strips and/or pitted ripe black olives

In large bowl beat mayonnaise, milk, mustard, salt and pepper with a whisk or fork until blended. Add potatoes, green beans, celery and onions; fold gently until well coated with dressing. Cover and refrigerate at least 2 hours. Leave in bowl or line a serving platter with romaine lettuce and spoon salad in center. Garnish.