Copycat Ding's Coleslaw - Whole30, Paleo

1 In a large bowl, combine the mayonnaise, mustard, vinegar, horseradish, granulated onion and black pepper. Whisk the dressing to combine.
2 Add the cabbage, scallions, parsley and pickles. Toss everything to coat, cover and refrigerate 1 hour. Taste the coleslaw for seasoning and adjust with salt and pepper as desired. Coleslaw can be made 4 to 5 days in advance.