Creme Fraiche (french Heavy or Double Creme)

Ingredients

• Allow American heavy cream and a tiny amount of buttermilk to stand
• at room temperature until the cream thickens. Use 1 tsp. buttermilk
• for each cup of cream. Heat it in a saucepan until it is lukewarm
• (85 degrees F), pour it into a glass container and let stand until
• thickened. Room should not be below 60 or above 85 degrees. Stores
• in refrigerator for about a week.