I’ll have to try this recipe in the next couple days. I keep reading about creme fraiche (or more properly créme fraîche) like it’s a wonderful thing, but I haven’t seen it in any stores here.
The recipe is at http://www.americastestkitchenfeed.com/do-it-yourself/2011/11/how-to-make-creme-fraiche/, basically it’s heavy cream allowed to ferment after some buttermilk is added to it.
I’ve seen various other make-your-own créme fraîche recipes in the last couple years, some use cream, some use yogurt, some use half-and-half, some use buttermilk. But I’ve had really good luck with recipes from America’s Test Kitchen and their sister site/magazine Cook’s Country, so I definitely want to try this one.