- 1 mason jar (16 ounces is perfect, bigger or smaller is fine, too)
- Heavy cream
- Pour heavy cream into a mason jar, no more than half way.
- Shake cream in mason jar. Shake for at least 20 minutes, checking your progress at the 10 minute mark.
- When there is butter in the jar, drain the buttermilk into a bowl (and save for a recipe!). Serve butter with warm better, serve and enjoy!