I dipped the sliced apples in some diluted lemon juice to stop them browning. The slices then went onto wooden spoons and metal skewers and I put them onto shelves in the oven. I haven't got a dehydrator so I used the oven set very low (about 50 oC) for about 12 hours. To make the most of having the oven on I dried about 15 apples. I wasn't sure whether to slice the apples with their skins on or not. I chose to peel them but it seemed a waste to through the peel away so I dried that too, spreading it out onto another shelf. One of the nice things about peeling the apples is that all the imperfections get removed from the apples before they are dried. It is then easy to remove any unappetising bits of the peel before drying that. The only parts that weren't dried were the cores - the rabbits got them. Once it was all in the oven I kept opening the oven door to let the moisture out for the first few hours.
I was really pleased with the result. The apples ended up in really interesting shapes from how they hung from the spoons and skewers - a little bit like snakes hanging from a tree. It's amazing how much an apple shrinks when dried. The apple slices have a really good consistency, they are fairly chewy and seem as though they would last a while stored. Having said that most of them have already been eaten in less than a week as snacks and lunchbox fillers. The dried peel is crispier and a little bit more fiddly to eat, but still tasty.