Can only the outer husk of nutmeg be used?

No, only the outer husk of nutmeg cannot be used; both the outer husk and the seed are utilized. The outer husk, or mace, is the red, lacy covering that surrounds the nutmeg seed and is used as a spice. The actual nutmeg seed is also grated or ground to produce the spice known for its warm and aromatic flavor. Both parts are valued in culinary applications, but they serve different flavor profiles.