You don’t need any machines to make hand-made butter. And all it takes is one basic ingredient: cold heavy cream. The only other thing you need is a Mason jar—oh, and some arm power. Because you’re going to shake, shake, shake! For about 15 to 20 minutes until the cream solidifies, and the buttermilk separates. Watch the video, then get the recipe for Chef John’s Homemade Butter. Go ahead, give it a shake!