In a jar with a lid, place whipping cream and
buttermilk or sour cream; cover securely and shake 15 seconds. Set
aside at room temperature for 24 hours or until very thick. Stir once
or twice during that time. Cream will thick faster if the room is
warm.
Stir thickened creme fraiche well. Refrigerate at least 6 hours before
serving. Cover tightly and store in refrigerator for up to 2 weeks.
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