It’s the seed of the evergreen tree.
Mace is the fleshy lattice, covering of the nutmeg(hard nut), which is golden brown in color.
Nutmeg has more robust flavor than mace. Nutmeg is used to add sweet and savory flavor to dishes such as cakes, vegetables, egg dishes, lamb, fish and beverages.
Like nutmeg, mace is a sweet and flavorful spice, which can be substituted for nutmeg or cinnamon to compliment a variety of foods.
Mace is also used in sauces for fish, pickles and chutneys.