What you will need:
- One quart of heavy whipping cream
- One large blender
- A wooden spoon
- One large bowl
- Salt (optional)
Before delving into the process, a note about the cream: do not buy ultra-homogenized cream. The task of making butter basically involves separating the fat from the milk. Homogenization is a process that does exactly the opposite, so homogenized cream won't separate the way we desire.
At least six hours prior to making the butter, set your quart on the kitchen counter so it can reach room temperature. Don't worry... it won't spoil. Besides, butter is traditionally made from spoiled cream, so it won't matter, anyway.
Pour the cream into your blender, and now... here comes the really hard part, are you ready?... turn the blender on. The speed doesn't really matter. Some people make butter simply by putting cream in a jar and shaking it vigorously. The low setting on the blender should be sufficient, although I used a higher speed.
In the span of about 3 minutes, the cream will form what are called "peaks" which is a fancy way of saying it is thickening... forming whipped cream (surprise, surprise). Different stages of peaks are used by chefs for baking, pastries, and other goodies. We want to take the process a little further. As the mixture stiffens, you may need to pause the blending and stir things up a bit with your spoon. Then, in a moment that you will miss if you blink, the entire mixture collapses into a pale yellow liquid. At this point, you have a puree of butter and buttermilk.
About 20-30 seconds after the collapse, stop blending and pour the mixture into your bowl. We now need to give the fat globules (the butter) time to coagulate... about an hour or so. (You can speed this process by stirring the product in the bowl with a whipping utensil). You will know the coagulation is done when the product does not look fluid anymore. At this point, a bit of agitation with your spoon (in plain talk, that means stirring) will separate the coagulated butter from the buttermilk. Pour out the buttermilk (into a container if you wish to save it) and then repeat... stir and pour.
When it appears you have removed all the buttermilk, you haven't. You will need to rinse the butter with cold water to ensure all the buttermilk is gone. Otherwise, your butter will go rancid in a matter of days. Don't be afraid to apply a generous dose of water.. it won't mix with the butter no matter how hard you try. Stir the mixture up a bit and pour the water out. Repeat until the water remains clear after stirring.
The butter is obviously very soft at this point because it is at room temperature. If you want to salt your butter or add any other flavor, mix the spices in while the butter is still soft. Your final step is to scoop the butter into your desired container... tupperware, wax paper, whatever... and stick it in the fridge.