Pour the cold cream into your food processor. You can also use an electric whisk or stand mixer.

Whip the cream until it separates. After around 2 ½ minutes you will see it start to over whip and really thicken. Keep going. After around 4 minutes it should be fully separated. You can see yellow buttery solids and cloudy liquid at this point.

The liquid that remains is buttermilk. Save it in the fridge and use it in your baking or to marinade meat.

Squeeze the butter solids in your hands to make sure there is no more buttermilk in there. You want to remove it all otherwise your butter will be wet. Also you can squeeze it in a clean tea towel or a cheesecloth.

Stir in some salt or flavors to your soft butter. This recipe will yield you over 2 sticks/ 10 oz/ 300g of butter.