1 c. heavy cream
Pinch of salt (optional)

Pour heavy cream into a watertight container. Cap. Shake vigorously for 30 to 40 minutes. (Children can take turns shaking while singing favorite songs). Pour off buttermilk. Add a pinch of salt. Work the butter with a spoon. Continue to pour off buttermilk as it come out of butter. Refrigerate. Enjoy on crackers or toast!