Dressing:
In a medium mixing bowl, add Vinegar, Mayonnaise, Salt, Sugar and Celery Seed.
Wisk well.

Slaw:
In a large mixing bowl, toss the Coleslaw Mix and onion together.

Directions:
Pour the Dressing over the Slaw and mix well.
The slaw can be served immediately, but it is much better if allowed to stand refrigerated and tossed occasionally for 30 minutes to 1 hour.
For a very limp slaw, refrigerate several hours or overnight.
Coleslaw is the perfect opportunity to make a recipe your very own. Adjust the recipe to your taste, experiment a little. Add more mayonnaise, substitute sour cream or yogurt for some (but not all) of the mayonnaise. Add diced green and/or red peppers, or diced celery for an extra fresh crunch.
If using fresh cabbage, use one white cabbage and one red cabbage to add a touch of color.
Who knows, you could be famous one day! 
  
Note:This makes enough coleslaw for a medium get together of about 10 people.