Use a hand mixer and whip the cream. Continue until you can clearly see that the cream separates. The solid is butter, the liquid is called “buttermilk”
 Use a spatula and take everything out of the bowl. The buttermilk can be frozen. It makes nice dough liquid for baking bread.
 Form the butter into a ball with your hands.
 Put the butter in a large bowl with cold water and knead it with your hands to get out all the buttermilk. Change the water 3-4 times and knead the butter well between each time.
 Knead salt to taste into the butter.
 Wrap the butter into waxed paper and store it in the refrigerator.