1 hour ago, kayb said:
WTF does one do with horseradish to get it from this form to useable? I have no experience.
I think they're giant parsnips.
I don't think its horseradish. It grew wild on our farm and those would be the weirdest horseradish roots I've ever seen. If it were horseradish, your fridge would be very fragrant by now. To make horseradish, blender, vinegar, salt, gas mask. Do it outside. You have been warned.