Kefir can make an excellent (not to mention a nutrient dense super food) sour cream! Here's how:
Once your kefir is done and the grains are removed, line a large mesh strainer (I ordered mine from Cultures for Health) with a couple layers of cheesecloth. Place strainer in a bowl or other collection container. Pour desired amount of kefir into the cheesecloth/strainer. Allow to sit in the fridge for a couple of days, until the whey has drained off and you have soft curds. Whisk gently and enjoy this tangy treat!
Another option at this point is to whisk in a few tablespoons of your favorite jam and enjoy it as a cream cheese on your bagels or crackers. You can also sweeten lightly with honey and enjoy on fruit!
Add a flavorful punch (and enjoy as a veggie dip or spread on whole grain crackers) by whisking in a garlic seasoning blend of your choice. Here is a recipe for a kefir dressing, this uses fresh kefir (not whey strained/thickened).