Provide advice on how to accomplish the following goal. Give ONLY the advice, no other words or explanation.
For example:

Answer: <advice, as short as possible; a single sentence!>.

Goal: Make sour cream
To make sour cream, you just need buttermilk and heavy cream or half and half. Heavy cream will result in a thicker sour cream, so choose based on the texture you're looking for. Add 2 to 3 tablespoons of buttermilk per cup of heavy cream or half and half and let it sit at room temperature for 1 to 2 days
Culture heavy cream with lemon juice or vinegar for 24 hours.