See the 42 Second Version: "Shaking Butter Like A Boss"
Note: This method takes 5-10 minutes, but Dan Rojas with GreenPowerScience found a way to make the butter in under a minute by using a water bottle. Check out his video here:
Step 1: Watch the Video!
WARNING: Use safe practices when handling food to avoid contamination, and only use milk or cream from trusted and approved sources. Shaking cream into butter may result in an amazing workout. Use of video content is at own risk.
Step 2: Get Some Heavy Cream or Whipping Cream
My wife knows a lady with a cow, so one night we stopped by and picked up a gallon. After letting it sit in the refrigerator overnight, we could see a faint line showing where the cream had risen to the top, with the milk underneath.
The trick is to skim the cream off the top, and capture it into a container. I used a wide mouth mason jar.
Note: If you don't have access to a cow, a heavy cream, or whipping cream will work just as well.
Step 3: Butter Churning: Step 1
The method that worked well for me was to shake the jar up and down for 2-3 minutes as hard and as quickly as I could.
If you're using whipping cream, then after 3 minutes you shouldn't hear any more sloshing around in the jar. If you take the lid off to peak inside, you should find that it's turned to a light and fluffy whipped cream.
You could add a little sugar and stop here if you wanted. But if you want butter, you'll need to continue on.
Reminder: This method takes a little while because the sides of the jar are smooth. You can see how my friend Dan Rojas found a way to make the butter in under a minute by using a water bottle.