Storage: Keep refrigerated in a sealed container for up to 7 days; shake or stir before using.
Consistency: For thicker dip, use a little less buttermilk or add an extra spoonful of sour cream. For thinner dressing, whisk in more buttermilk (or a splash of milk) a little at a time.
Herbs: Fresh herbs taste brightest, but dried herbs work—use about 1/3 the amount when substituting dried for fresh.
Variations: Add a pinch of cayenne or a few drops of hot sauce for heat, or blend in 1/2 avocado for a creamy green version.