Pour the cold cream and salt into your stand mixer. You can also use a food processor or an electric whisk.
Whip the cream until it separates. It will really thicken before it begins to separate. It will take roughly 4 to 5 minutes.
After it separates, pour the contents through a fine-mesh strainer that is set on top of a large bowl or pitcher. *NOTE
Rinse the butter with 2 cups cold water, squeeze butter to remove all of the water.
Place in bowl or form into sticks, by wrapping in wax or parchment paper and store in the refrigerator for up to 6 weeks.
Video
Notes
The liquid that strains through is known as buttermilk. However, it is NOT the same as buttermilk that you buy at the store.To make cultured buttermilk, you will need to add an acid, such as vinegar, lemon, juice, or cultured yogurt to the buttermilk liquid. I would use about a tablespoonStir it in, then allow the mixture to sit at room temperature for 24 hours. As a result, the acid will curdle and the cultured buttermilk will thicken.At that point, store it in a covered container in the refrigerator for up to 6 weeks. it can be used to make buttermilk pancakes, muffins, dressing, or anything else that calls for cultured buttermilk.