sour cream 
noun [mass noun]
Cream which has been deliberately fermented by the addition of certain bacteria.Milk, butter, sour cream, and curd cheese were traditionally highly prized additions to the diet....
- Whip them up with butter, sour cream or cream cheese to spread on everything from toast to potatoes to steak to squash.
- If you prefer a chunky soup, simply add cream cheese and sour cream to the pot once the asparagus is tender.
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