01 -
Combine mayonnaise, whole grain mustard, spicy brown mustard, horseradish, dark brown sugar, and cajun seasoning in a small bowl. Stir thoroughly until the mixture is homogeneous.
02 -
Cover and refrigerate the blended mixture for 30 minutes to allow flavors to meld.
03 -
Remove from the refrigerator, stir well, and taste. Adjust seasoning as needed, considering variation in cajun seasoning spice level and horseradish heat.