Now I may be wrong, but I thought (like Uncle Dirty Dave hints) that mustard was naturally hot in its own right. It's just that the stuff you put on your hot dog has been cut a zillion to one. I don't believe Chinese mustard normally contains horse radish, does it? It's just more pure than the domestic stuff. Don't get me wrong, I like the rush from both mustard and "the root" as much as El Grande, but I think they are two different things. Speak up experts Fred the habaneronut