> As an aside, my personal view is that making your own butter doesn't provide anywhere near the same return on investment as making your own bread - home made butter takes ages, doesn't really taste that much better, and can cost more money, while home made bread doesn't take that long, and can taste a lot better.

There is a good book called "Make the Bread, Buy the Butter" which covers what foods give the best return on time, effort, and money invested.