Celeriac, also called celery root, knob celery, and turnip-rooted celery, is a variety of celery cultivated for its edible stem or hypocotyl, and shoots. Celeriac is like a root vegetable except it has a bulbous hypocotyl with many small roots attached.
Celeriac is a root vegetable. The taste is similar to a turnip or potato, with an earthy taste, and just a small hint of celery flavor. Celeric's large benefit is its versatility. Like its root vegetable cousins, celeriac easily takes on other flavors and textures depending on how it is cooked.
Recipes: https://www.epicurious.com/expert-advice/15-best-celeriac-recipes-article
