Store in plastic bags in the refrigerator where it won’t dry out. Celeriac needs high humidity in order to stay crisp, so put a few drops of water in your plastic bags. Under these conditions, it can easily keep until May!
Boil and mash as you would potatoes (with copious amounts of cream and butter, if you like).
Slice and add as a garnish for Bloody Marys.
Whatever you choose to do, be sure to peel the ugly outer layer first!