Mary Jo's Chicken Casserole

Ingredients

• 1 package wild rice mix
• 3 cups chopped, cooked chicken
• 1 can cream of celery soup
• 1, 4 ounce jar pimento, diced
• 1 onion, chopped
• 2 cups French-style green beans, drained
• 1 cup mayonnaise
• 1 can water chestnuts
• salt and pepper to taste