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You will need 3 to 4 gallons of coleslaw to feed 100 people. It  will take one pound of cabbage for every 5 people.
Note -- The sweeter version of the mustard dressing is great for a vinegar coleslaw if you discover that you have accidentally gotten one of those occasional cabbages that are a touch on the bitter side. Note -- feel free to play with other seasonings, more complex blends, flavored oils, and flavored vinegars.