@eirene_belle: 💪 It will require a bit more muscle and time if you are shaking the heavy cream in a jar and you're likely to make a bit of a mess, but making traditional homemade butter is delightfully simple. Pour 1 liter (~34 oz) of room-temperature heavy cream (36% to 40% milkfat) into a churn, jar, or stand mixer. Agitate until the cream turns to whipped cream, then separates into a buttery yellow mass and liquid buttermilk.