To a medium size bowl, add the shredded chicken, chopped celery, grapes, onions, and almonds. In a small bowl, mix the mayonnaise with the lemon juice and salt and pepper. Add the mayo mixture to the bowl with the chicken and mix well. Taste for seasoning and adjust to your taste. Serve the chicken salad on croissants or bread, or over salad greens. Refrigerate for 3-4 days.