Chef John's Creme Fraiche
Making creme fraiche is very easy and, once you taste the magic of homemade sour cream, you'll have a hard time not repeating this esoteric exercise. Sure it takes a couple days, but the effort is minimal and the payoff is marvelous.
Recipe Summary test
Be sure to use the best, freshest cream you can find. Look for pasteurized, not ultra-pasteurized heavy whipping cream. Make sure to use cultured buttermilk, otherwise you will wait a full day to see nothing happen.