We read the book "Let's Make Butter" this week, and A wanted to try to make his own. We started by skimming the cream off of whole milk and putting it in a clean glass jar.
Then you do the shake shake shake for a ridiculously long time. A and I would trade back and forth as our arms would tire, and after a while, the little globules of butter started to separate.
A was thrilled at the end when the butter clumped. We drained it, rinsed several times, and he had some on a piece of wheat bread. Yum!