2 cups heavy cream
1-2 cups ice water
sea salt to taste, optional
Place cream on the counter for 8-12 hours. It is easiest to use cream that is just slightly souring. If your cream is not yet turning, let it sit on the counter for 12 hours to allow bacteria to form lactic acid or add a spoonful of yogurt or buttermilk with live cultures to the cream prior to letting it sit to culture it.
Pour cream into a quart-size canning jar. Begin shaking with slow, deliberate shakes until cream first starts coating the jar, becomes thick like whipping cream and then starts to pull away from the sides, turning to two substances: buttermilk and butter. Let the jar sit for one minute and then pour off the buttermilk into a separate glass.
Pour ice water into the butter to wash it, kneading with hand or stirring to remove any milk, strain off land repeat until water is clear. Strain to leave only the butter in the jar. Stir in salt, if desired. Use immediately or refrigerate until ready to use.
Makes approximately 1/2 cup butter
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