Mace is a highly flavored spice. It is the dried form of the red, netlike aril, or membrane, covering the nutmeg seed kernel (see Nutmeg ). When fresh, this membrane is fleshy and smells and tastes like nutmeg. It is removed from the kernel and dried in the sun for its use as a spice. As it dries, the membrane turns orange-yellow and acquires a strong aroma. Mace is sold in whole or ground form.