Ultimate Chicken Salad Sandwich

Ingredients (10)

• 2 stalks celery, chopped
• 1/2 cup pine nuts, toasted
• 1 cup sliced green grapes
• 4 scallions, chopped
• 2 cups poached chicken, chopped
• 1 cup mayonnaise, preferably homemade
• 2 tablespoons Dijon mustard
• Salt and pepper, to taste
• Arugula, for serving
• Soft sandwich bread, for serving