Celery flake is great for when you don't have fresh celery on hand. This dried vegetable packs a strong flavor and goes great in soups, stews, and braises; potato salad, coleslaw, egg salad, tuna salad, and all sorts of chopped salads; as well as other hydrating dishes. If you add it to a moist dish, there's no need to rehydrate, otherwise you can soak celery flake in water for 5-10 minutes before use.