In a mixing bowl, whisk together all the ingredients until smooth. If you want it sweeter, add extra honey. If you want it extra tangy, add more mustard.
Transfer it into a sealable container or a sterilized jar.
Notes
Serving size is 2 heaped tablespoons. TO STORE: Honey mustard should be stored in the refrigerator, covered. The mustard will keep well for up to 4 weeks. TO FREEZE: Place leftover honey mustard in a shallow container and store it in the freezer for up to 6 months.