| 1/2 | cup plain fat-free yogurt |
| 1 | tablespoon fat-free mayonnaise or salad dressing |
| 1 | teaspoon chopped fresh or 1/2 teaspoon dried dill weed |
| 1 | teaspoon Dijon mustard |
| 1/4 | teaspoon salt |
| 1 | large white potato, cooked and cubed (2 cups) |
| 1 | large sweet potato, cooked and cubed (2 cups) |
| 1 | small stalk celery, chopped (1/3 cup) |
| 1/4 | cup sliced radishes |
| 2 | medium green onions, chopped (2 tablespoons) |