There are many varieties of hot mustard, but the one that's probably most familiar is the hot mustard found at the bottom of American take-out Chinese bags (ie, English mustard). This mustard is actually a mix of yellow and brown mustard seeds. Besides, it forgoes the vinegar to unleash as much heat as possible! It is worth noting that mustard is effectively used in reducing stiff muscles, painful joints, stuffed up phlegm, tumors as well as pneumonia.