- Wash a bunch of grapes and put them in a container.
- Put the container in the back of the refrigerator.
- Forget about it for a couple of months.
- Find the container, then put it back.
- Repeat steps 3 and 4.
On the plus side, my way is easier, plus the raisins stay on the vine, which is kind of neat.
On the minus side, it takes a lot longer, and you might have to pick out the moldy ones every once in a while.
(See more photos in the Flickr set. Though they all look pretty much the same.)