Add ¼ cup of baked ham pan juices to a small saucepan, or substitute pan juices with olive oil. Stir in the remaining mustard sauce ingredients as you heat them over medium heat.
Once mixed, whisk the sauce over low heat until it begins to boil then simmer for a few minutes until it thickens.
Serve mustard sauce with ham, or use as a dipping sauce with seafood or chicken.
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Notes
Nutrition calculations were done using ¼ cup olive oil (instead of pan juices).
Although I've found that using ¼ cup of the pan juices enhances the flavor of the mustard sauce, feel free to substitute the pan juices with mayonnaise.
You can also substitute the pan juices with olive oil for a healthier alternative.
Red wine vinegar or white wine vinegar can be used in the recipe.
If you don't have Dijon mustard, substitute with plain mustard and a tablespoon or more of horseradish sauce.
Try experimenting with other herbs and spices to see what you can come up with.