Place the mayonnaise, buttermilk, lemon juice, apple cider vinegar, caster sugar, salt and pepper into the TM bowl.
Mix on Speed 6 for 20 seconds or until well combined.
Add the cabbage, apples, carrot, celery, spring onions and red onion to the bowl.
Chop on Speed 4 for 2-3 seconds.
Scrape down the sides of the bowl and repeat until the coleslaw is the consistency you would like.
Pour over the dressing and stir to combine.
Refrigerate until required.