Just the butter. It's got the cinnamon and a bit of sugar in with the apple slices already.

[He liked to let the slices sit to soak it in a bit, the sugar causing the apple to let out it's juices a bit like it did with some other fruits. Made for a nice little bit of 'syrup' to start with. Even if it was just some thought, felt like it made the flavors stick better when cooked.

Worked for him.]

Start with half the stick, can take a look from there.