I make this copycat version from Tom Wilbur so Dugan will stop hoarding packages of the Hot Mustard Sauce from McDonalds.
- Combine all ingredients in a small covered saucepan. Whisk until smooth.
- Turn heat to medium and bring to a boil, stirring often.
- Sauce should thicken in 2 to 3 minutes after it begins to boil.
- Remove from heat and chill in the refrigerator in a covered container.