A powdered spice made from the root vegetable known as the horseradish root that is a member of the mustard family. It is the pungent oil contained in the root that gives horseradish powder its spicy, hot flavor. The root is dried and ground into a powder form to be used to flavor a variety of horseradish sauces, food toppings, and similar condiments. The horseradish powder is similar to wasabi, a Japanese seasoning that is very spicy and hot tasting.