Ingredients

• 1 cup mayonnaise or 1 cup salad dressing
• 1/2 cup sour cream
• 1 tablespoon lemon juice or 1 tablespoon vinegar
• 1 tablespoon dried tarragon
• 1 tablespoon dijon-style mustard
• 1 teaspoon sugar (1 to 2 teaspoons, to taste)
• 2 (12 ounce) cans tuna in water, drained (or albacore)
• 2 cups frozen green peas, no need to thaw
• 1 lb shell pasta, cooked to al dente, drained and cooled