Mace comes from the Nutmeg tree, which is native to Banda, the largest of the Moluccas Islands (or Spice Islands) in Indonesia. They are also grown in the Caribbean, or more specifically, in Grenada.
Nutmeg trees, which have been cultivated for over a thousand years, must mature for 7-9 years before the first harvest occurs. The trees produce for many years, reaching their full potential after 20 years. Nutmeg comes from the seed, or nut, found inside the fruit of the tree. This seed is covered with a red membrane called an aril, and this membrane is ground into mace. As you can imagine, harvesting mace is a tedious process, with only a little mace captured from each nut.
The flavor of mace is described as being a combination of cinnamon and pepper. It is more pungent than nutmeg. Used in baking, desserts, as well as in savory dishes such as roasted meats. Use sparingly as it is pungent.