|"Is this all real? Or has this been happening inside my head?"
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Horseradish (binomial name Armoracia rusticana) is a perennial plant of the Brassicaceae family (which also includes mustard, wasabi, broccoli, and cabbage). Its large white, tapered root is used, when grated, as a spice with a distinctive pungent aroma spice.
- Horseradish on Wikipedia