Wash and finely chop cabbage until you have approximately 4 cups.
Scrub carrots or peel them before coarsely grating.
Peel and finely dice onion.
In a large bowl, stir to combine vegetables. Then stir in mayonnaise until desired creaminess is achieved. Add vinegar at the end to provide some tanginess and slightly water down the mayo.
Cover and keep refrigerated until ready to serve. Can be made in advance. Consume within 3 days.