(Armoracia rusticana) Just like any fresh, garden produce, the flavor of fresh horseradish root is mind blowing! My mouth is watering just writing this. Try it in place of wasabi for homemade sushi rolls!
This perennial plant easily spreads so plant it somewhere that you don't mind it spreading and that you can easily dig up to harvest some each year. Regular harvest keeps it in check. Alternatively you can plant in a raised bed or large pot. I have mine in a part sun location and it does well. Here's some more info on growing horseradish in a pot.