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Crème Fraiche

1 cup heavy or whipping cream, room temperature

1 tablespoon buttermilk or 1/2 cup sour cream, room temperature

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. NOTE: Cream will thicken 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.