Put your cream into a mixer with a balloon whisk.
Whisk until the solid and liquid separates.
Drain off the liquid into a bowl with a sieve.
Put the solids into a large bowl of ice water, and using clean hands, squeeze it together to wash the butter. Change the water and repeat.
Add any salt you'd like to at this point.
Press the solid butter into shape using baking paper, wrap well and store.
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