Horseradish is not made of anything but a plant.

Horseradish (scientific name: Armoracia rusticana), also known as Western Beetle, Horse Radish, Mountain Radish, Powdered Wasabi, Western Wasabi, native to Southeastern Europe, is a perennial, persistent, cold-hardy plant of the genus Horseradish, family Cruciferae.

Horseradish prefers cool, hardy, avoid wet. Horseradish like cool climate, drought tolerance, intolerance of rain and flooding, with deep soil, water retention, fertilizer retention of sandy loam, pH 6 slightly acidic soil is better, avoid continuous cultivation.

Expanded Information

Horseradish is rarely subject to underground pests due to the pungent flavor of its underground roots.

It can be used as a vegetable and has a sinus-stimulating spicy flavor. Horseradish is used in European countries as a condiment for dishes such as roast beef, in addition to being white after peeling, and is used as an ingredient in imitation wasabi seasoning after adding food coloring.

Baidu Encyclopedia - Horseradish