Years ago, the best deli in Birmingham was in the tiny suburb of Cahaba Heights. The classic item was a turkey sandwich with a hot honey mustard sauce. I finally got the recipe for the sauce from them, and not much could be simpler.
Here are the grand total of the three ingredients.
12 ounces whole grain Mustard
8 ounces Honey
Powdered hot Mustard
Put as much of the last ingredient in it as you dare. This is also known as Oriental mustard, though ours came from Canada. It varies greatly in heat level, and as a menu at a Chinese restaurant we frequented used to say, “it gives you a pleasant burning sensation up your sinuses.” Fair warning.
Alas, the deli has long since closed, but hot honey mustard lives on, as does that pleasant burning sensation. That one is forever.