Generally you'd put mustard on a grilled hotdog, but if you happen to grill your hand or some other part of your body you'll want to slather on the spicy condiment as well. Why? As Instructables user kazmataz notes, it's suitable for relieving mild burns. Here's what you need to do:
Put the burned part of your body part under cool, running water. This will relieve some of the pain right away and will help to stop the progression of the burning. [Next,]spread a nice and thick layer of mustard over the area and go about your Iron Cheffing. You'll find that the pain goes away almost immediately.
We're not entirely sure what it is about mustard that blocks the burning pain, but many mustard-users have claimed it also helps reduce discolouration and blisters as well. While you don't want to rely on mustard for more severe burns, it can be a big help for the little ones.
Mustard Burn Relief [Instructables]