Yesterday we had so much fun. We made our own butter. It was a great experience. It took no more than 30 minutes and everyone really enjoyed it. This was inspired by Little House in the Big Woods which I just began reading to my 5 year old, but all of the kids enjoyed the experience. You can see how to do it and our results at my blog.
http://teachingbabytoread.com/2012/04/06/making-butter-with-kids-inspired-by-little-house-books.aspx