Horseradish is a type of spice. It comes from the root of the plant of the same name. Horseradish is traditionally made by shaving or mincing the root into a wet paste mixed with vinegar. It is used in a variety of dishes as an ingredient or as a sauce or garnish. As an ingredient, it is used to make several sauces including cocktail sauce for seafood. As a side, it is commonly used as a condiment with roast beef. Horseradish has a pungent sharp flavor and should be used sparingly.