Core and shred one large cabbage and place in a big mixing bowl. Add in minced red onion and green onion.

Prepare coleslaw dressing recipe, in a separate bowl whisk together until smooth: mayonnaise, prepared horseradish, apple cider vinegar, granulated sugar, salt, black pepper, and milk.

Pour coleslaw dressing over the shredded cabbage mixture.

Stir so the dressing and the cabbage are thoroughly mixed.

Refrigerate.