In a large bowl, mix the mayo, green onion, apple juice, vinegar, and parsley together until combined. Place coleslaw mix and chopped apple on top.
Toss everything together when 10-20 minutes away from serving and put back in the fridge to continue to chill. Taste and adjust any seasonings! Serve cold.
Notes
You can buy pre-shredded coleslaw mix most places, just toss out the dressing if it comes with it. I used Trader Joe's here.
Gala, Granny Smith (green) or Fuji apples can be subbed for honeycrisp, but I like honeycrisp the best.
This serves 4-6 people depending on portion sizes and whether you're using it as a side dish or topping on BBQ sandwiches.