In a large bowl, whisk together the mayonnaise, vinegar, olive oil, horseradish, red pepper flakes, Italian seasoning, 1 teaspoon salt and 1/4 teaspoon pepper. Add the cabbage, scallions, carrots, fennel and parsley; toss to coat. Season to taste with salt and pepper. Let stand in the refrigerator for 15 minutes before serving.
In a small bowl, mix together the basil, marjoram, oregano, parsley, granulated garlic, rosemary, thyme and red pepper flakes. Store in a jar with a tight-fitting lid.