1, the definition of the difference:

Mustard, also known as mustard seeds, Western yam cabbage, mustard powder, generally divided into green mustard and yellow mustard two kinds. Yellow mustard originated in China, is the seeds of mustard ground from; green mustard (green mustard spicy) originated in Europe, with horseradish (horse radish) manufacturing, add coloring was green, its spicy smell is stronger than yellow mustard, and has a unique aroma.

Horseradish, also known as: horse radish, wasabi radish, etc., belongs to the dicotyledonous plants, cabbage, cruciferous, horseradish perennial erect herbs. All hairless. The root is fleshy and fat, fusiform, white, and branched in the lower part. Stem stout, surface with longitudinal grooves, much branched.

2, the difference in flavor:

Horseradish contains pungent isothiocyanate compounds with bactericidal properties. The intact mustard seed itself is not spicy. It is only after the mustard seed is crushed and water is added that the mustard thioglycosides and the mustard enzyme contained in it hydrolyze and react to produce the pungent isothiocyanates.

3, the role of the difference:

Horseradish is native to Central Europe, the early days are only medicinal plants, used to treat coughs, rheumatism and other diseases. Mustard seeds have appeared in the Stone Age, ancient Europeans generally regarded mustard seeds as medicine rather than food, used to treat a range of diseases such as toothache.