Creme Fraiche - cooking recipe

Ingredients

1 cup heavy cream
1 teaspoon buttermilk

Preparation

Heat the heavy cream to body temp not over, about 100\u00b0F.
Stir in the buttermilk.
Keep in a warm place for 12-36 hours until it thickens.
If your house is cool, place it in the oven with the oven light on.
When it has thickened slightly stir, cover and refrigerate until using.