INGREDIENTS
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4 cups cubed (1/2 inch) cooked chicken (about 1 3/4 pound)
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1 cup walnuts,toasted and chopped
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1 celery rib, cut into 1/4-inch-thick slices (1 cup)
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2 tablespoons finely chopped shallot
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2 cups halved seedless red grapes
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3/4 cup mayonnaise
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3 tablespoons tarragon vinegar
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2 tablespoons finely chopped fresh tarragon
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1/2 teaspoon salt
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1/2 teaspoon black pepper