What is crème fraîche?

Answer Heavy cream mixed with a lactic acid such as buttermilk

Crème fraîche is created when a cream is combined with a lactic acid, such as buttermilk or yogurt. They are stirred together and allowed to ferment slightly. The result is a firm, rich cream, which can be stirred to make it creamier. It is not as sour, hence the name "fraîche" or "fresh." It is delicious served with berries or eaten in the same manner as a cream cheese.

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