Instead of heating and waiting, butter is a totally raw food.
Also unlike yogurt and cheese, butter is a good workout.
Step 1: get some heavy cream (I used raw from the farmers' market and I highly recommend it)
Step 2: put it in a container with a good seal (I used a lock-n-lock container)
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Basically, you first make whipped cream. When you continue shaking after the whipped cream, the cream gets thicker and then breaks down. Continued shaking results in butter and a special splash: buttermilk!
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Throw your butter into a bowl and pour in some water. Knead the butter and dump out the water. Continue this process until the water is clear. Why? You're rinsing off excess buttermilk. If you were to leave it on there, the butter would go off much more rapidly and you'd be left with nasty rancid butter. For my rinsing step, I actually used a colander, but it was a lousy choice, as the picture below demonstrates.
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Overall, making butter is easy, sort of fun, and definitely quite an experience. Probably a good science experiment for children, but I don't know the actual science behind the cream to butter process, so I probably won't be using it as a lesson any time soon. Do you know the science behind butter? I've got an interview for Teach for America coming up, and I could use a great mini-lesson. Props are encouraged and I'm sure they wouldn't turn up their noses at some butter time.