Céléri rémoulade is a classic French slaw-like salad made with celery root and mayonnaise. We built on that and turned it into this bright, fresh chicken salad. The celery root is prepared two ways: Half is cut into matchsticks, half is shredded on the large holes of a box grater. The combination heightens the salad's textural and visual appeal. You could poach and shred chicken breasts for this recipe, or you can simply shred the meat of a store-bought rotisserie chicken. Serve the salad on a bed of arugula.