Start with chopping or shredding the cabbage, then add 5 cups of the chopped green cabbage to a very big bowl.
Toss the cabbage with the chopped or shredded carrot and green bell pepper.
Mix the mayonnaise, mustard, apple cider vinegar, celery seeds, white sugar, brown sugar, salt, and pepper in a different bowl. Taste for acidity and seasoning, then make any necessary adjustments. Add extra sugar if the dressing tastes too acidic.
Mix well after adding three-fourths of the dressing to the cabbage, bell pepper, and carrot.
Add a bit of additional dressing if the cole slaw seems dry. To let the flavours meld and the cabbage soften, eat straight away or place in the refrigerator for approximately an hour.