Chicken Salad with Grapes and Walnuts

A very good company recipe. Can prepare it ahead.
- Jeanne "Grammy"

INGREDIENTS

4 cups cubed (½ inch) cooked chicken (about 1¾ lb)
1 cup walnuts, toasted and chopped
1 celery rib, cut into ¼ inch thick slices (1 cup)
2 tablespoons finely chopped shallot
2 cups halved seedless red grapes
¾ cup mayonnaise
3 tablespoons tarragon vinegar (I used red wine vinegar)
2 tablespoons finely chopped fresh tarragon
½ teaspoon salt
½ teaspoon black pepper

INSTRUCTIONS

Toss together all ingredients in a large bowl until combined well. Makes 4-6 servings.