The celeriac stick is cut lengthwise. The sticks have an average thickness of 3 millimeters. The celeriac can be used for many different dishes. The vegetable can be baked, boiled, or stewed. Also great to use in broth, hearty soup, or mashed potatoes. It is an essential vegetable in Dutch pea soup. Raw or briefly blanched, the celeriac is also very flavorful.