If you are using a jar, pour heavy cream in thr jar until it is half full
Seal tightly and shake vigorously
This will take a while. You will hear it, stop hearing it, and then hear it again
It is done when you hear it again
You will see butter and buttermilk in the jar
Rinse the butter with cold water and add salt if desired
If you are using a stand mixer, it will work a lot faster
Add 2 cups of heavy cream to the mixer with the whisk
Beat on medium until it thickens and then separates into butter and buttermilk
It will be obvious
Rinse the butter with cold water to get off any buttermilk and add salt if you desire!
