Learn How to Make Sour Cream at home and then use it to make your baking even better or enjoy it on its own.
In a jar, mix the cream and lemon juice (or vinegar) together, then pour in the milk. Screw a lid on tightly and shake well.
Remove the lid and put a clean piece of kitchen paper over the jar and secure it with a rubber band.
Leave it on the counter overnight (up to 24 hours) for it to set up.
After 24 hours it should be quite firm. Give it a stir and cover it with a jar lid. It will keep in the refrigerator for 2 weeks or so if it lasts that long!