Crème fraîche is just homemade sour cream and is simple to make.

Ingredients

　　In a bowl, whisk together 1 part buttermilk with 8 parts non-ultra-pasteurized (and preferably non-homogenized) heavy cream. Cover with a cloth or plastic wrap, and leave it out on the counter for 24 to 48 hours, until it thickens. Whisk again before storing, tightly covered, in the refrigerator, where it will keep for several weeks; it gets thicker and more delicious as it ages. Crème fraîche has a higher fat content than commercial sour cream and so can be heated without breaking.

　　Cooking in the Moment