600ml thickened Cream
500ml Cold water
Insert butterfly whisk into thermomix bowl. Pour cream into mixing bowl and beat 1-3 min/speed 4, or until solids and liquids have separated. Remove butterfly whisk.
Strain liquids from solids, reserving buttermilk for later use, if wanted.
Place cold water and butter solids into mixing bowl and mix 5-10 sec/speed 4. Liquids and solids should separate again.
Strain liquids from solids a second time, so that only butter remains. Use as needed.
Adapted from the recipe