01 -
Combine mayonnaise, whole grain mustard, spicy brown mustard, horseradish, dark brown sugar, and Cajun seasoning in a small bowl.
02 -
Stir thoroughly until the mixture is well blended. Cover and refrigerate for at least 30 minutes to let the flavors meld.
03 -
Remove from refrigerator, stir, and taste. Adjust seasoning with additional Cajun spice or salt as needed based on desired level of heat and saltiness.