Granny's Homemade Butter

Ingredients:

cold heavy cream, about 40% butterfat

Use a mason jar. Fill half way, for room to shake, or butter churn and crank. Shake or churn for 15 to 20 minutes until milk and butter separate. Strain, and keep milk for other recipes. Run butter under cold water to make solid. Wrap in plastic wrap and chill until completely solid.

Source:   Granny's Favorites Cookbooks