How to Make McDonald's "Hot Mustard Sauce"
- Mix all of the ingredients together in a microwave safe container until it is one solid color. A fork works well for this. Microwave on high about 35 seconds, and mix again. Cover, and refrigerate at least 6 hours (to allow the flavors to meld) Refrigerate until needed, and remember to refrigerate unused portions. This recipe makes a little more than 4 "packets" of hot mustard sauce. Double it or triple it as needed.