how do you make butter

Begin by pouring your cream into a blender or food processor. Here I’m using slightly soured raw cream. It’s too far gone to be happy in coffee, but it’s not quite solid enough to be served up as sour cream.
Blend your cream, and be sure to have someone do the all-important job of keeping the lid on. (My four year old was eager to volunteer.)
After five or more minutes, the homemade butter will start to separate into butter and buttermilk. When you notice that happening, stop the blender and let the cream sit for a minute or two as the butter rises to the top.
Pour the buttermilk into another container, using a spoon to press as much buttermilk out of the butter as possible.
After you’ve washed the butter, pour off the water. Use a spoon or a spatula to squeeze out the last dregs of the buttermilk. What’s left is yummy homemade butter. I mix in sea salt with a spoon.