|  | Melt butter in a skillet and cook chopped onion until tender.  Cool.
Blend or process onion with sour cream, salt and pepper until smooth.
Transfer onion mixture to a bowl and stir in chives or green onion.
Refrigerate for 1 hour.
 
 Before serving add milk until the desired consistency.
 Serve with potato chips, raw vegetables or melba toasts.
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