Printed from The Hungry Housewife
8 oz Heavy Cream (not ultra pasteurized)
2 Tbsp Buttermilk
Pour the heavy cream in a glass jar with a lid (like a mason jar) add the Buttermilk.
Stir, lightly cover and let it sit out on the counter for 8-24 hours. It is done when it is the consistency of sour cream. Stir. Cover tightly. Keeps in the fridge for 7-10 days.
*you can use ultra pasteurized heavy cream, but it might take longer to set up*