Needed:
Heavy cream
A pinch of salt
A jar with a tightly fitting top
- Fill the jar about halfway full with heavy cream.
- Screw on the lid and shake for about 15 minutes. Note that about 10-12 minutes in, the cream gets so thick it's hard to shake at all. But persist!!! Just after that point, the butter gloms together, the buttermilk separates out and it becomes super easy to shake.
Enjoy!!!