I've brewed hard cider in my beer fermenter.

The hard part is finding cider that has not been pasteurized. You pretty much have to have a relationship with someone who has a cider press to get it, because they can't sell it, by law.

After that, it's just a matter of fermenting it. An old farmer, famous for his hard cider, told me he mixes a pound of sugar - white or brown, depending what flavor he's after - with each gallon of cider. You can also add things like cinnamon sticks or raisins at your own discretion.

I ferment it until it stops bubbling, then bottle it. It's not bad.

Another great thing to do with hard cider is make applejack. Wait for a VERY cold day, below zero fahrenheit, and freeze a quantity of your hard cider in a plastic soda bottle. The alcohol will all go to the middle. Tap the middle and drain out the liquor. It's tasty and VERY potent.