Two different flavours can be obtained from the nutmeg tree - nutmeg and nutmeg oil.
The nutmeg is the shell surrounding the nutmeg seed.

Nutmeg is a little more spicy, while mace is softer and more delicate in flavour.
Nutmeg can always be substituted for mace, but the opposite may not be possible.

Use: anywhere as a substitute for nutmeg - especially in desserts and warm drinks.
Muscatel is recommended to be used at the beginning of the cooking process.