there is a salad at a restaurant that is just greens, herb-dijon dressing, and celery root "julienne" (sp?) i LOVE the celery root and want to make this salad this weekend but i dont think i have ever seen celery root in the store. how does it come? do i have to cut it open like a pineapple or something? do i just slice it up? cook it? any advice would be very appreciated! thanks!