Finish the following sentence with the best choice: How to make butter in a jar?

Choices:
- Fill a jar halfway with heavy cream. Shake until the curd separates from the whey. Discard the whey and then refrigerate the curd.
- Fill a jar completely with heavy cream. Shake until the curd separates from the whey. Discard the whey and then refrigerate the curd.

Answer:
Fill a jar halfway with heavy cream. Shake until the curd separates from the whey. Discard the whey and then refrigerate the curd.