Please note: this sour cream recipe is only recommended for baking purposes, and not for condiment use such as baked potatoes.

2 cup heavy cream
2 tbs. buttermilk*

Combine whipping cream and buttermilk in a sterilized glass jar. Stir well. Cover loosely with lid or plastic wrap. Let stand in warm place until cream becomes thick, approximately 24-48 hours. Stir well.

*Homemade LDF Buttermilk

This buttermilk is only recommended for baking purposes.

1 1/2 tsp. lemon juice or vinegar
1/2 cup LDF milk

Stir lemon juice or vinegar into 1/2 cup milk. Let stand for 5 minutes.

From Cooks.com
Mooo News, November 2008