Mix thoroughly and store in an airtight container.
For the classic dressing, whisk 15 ml of your dry mix with 125 ml of mayonnaise, 125 ml of sour cream, and 65 ml of milk.
For a thinner, more pourable consistency, stir in extra milk.
For a thick veggie dip, combine 15-30 ml of dry mix with 250 ml of sour cream.