Easy to make, authentic, no thickeners, and full of probiotics. These are some of the reasons to make your own Russian Homemade Sour Cream or Smetana Recipe (Сметана). How to make sour cream.
Cover the jar with a cheesecloth and leave in a warm spot for 24-48 hours. In summertime, the warmer house temp should be enough. In winter, place in a warmed oven. Don't leave oven on!
The sour cream is ready when it is thick and creamy. It will thicken as you cover with plastic film and refrigerate for 12 hours before serving. Enjoy.