In a mixing bowl, combine all the dressing ingredients. Whisk until well combined, then add in coleslaw/cabbage mix. Mix until well coated. Ideally, refrigerate coleslaw for at least one hour before making sandwiches for best results.
1 8 oz. bag coleslaw mix, 1/4 cup mayo, 1 tbsp. white sugar, 1 tsp. apple cider vinegar, 1 tsp. lemon juice, 1/2 tsp. Dijon mustard, 1/4 tsp. black pepper, 1/4 tsp. salt