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["Bring large pot of water to boil and stir in 1 Tbsp.", "salt.", "Add in potatoes and return to boil.", "Reduce heat and simmer till potatoes are fork tender, 25 to 30 min.", "Drain and let stand till cold sufficient to handle.", "Peel potatoes and cut into 1-inch cubes.", "Gently toss together potatoes, artichokes, peas, celery, onion and parsley in mixing bowl.", "Set aside.", "Mix mayonnaise, yogurt, chopped tarragon, garlic, lemon juice, mustard, pepper and remaining 1/2 tsp.", "salt in separate bowl.", "Pour dressing over potatoes and toss to coat proportionately.", "Cover and refrigerateseveral hrs or possibly overnight to let flavors blend.", "Before serving, add in 2 to 3 Tbsp.", "nonfat lowfat milk if needed to moisten salad.", "Taste and adjust seasonings if necessary.", "Line serving platter with romaine leaves.", "Spoon potato salad on romaine and garnish with tomato slices and tarragon sprigs.", "Sprinkle with freshly grnd black pepper.", "Cooking: Spud Salad""