Nutmeg is the actual seed of the Myristica fragrans tree, roughly egg-shaped and about 20 to 30 mm (0.8 to 1 in) long and 15 to 18 mm (0.6 to 0.7 in) wide, and weighing between 5 and 10 g (0.2 and 0.4 oz) dried, while mace is the dried "lacy" reddish covering or arillus of the seed. This is the only tropical fruit that is the source of two different spices.
Nutmeg is a tasty addition to cheese sauces and is best grated fresh (see nutmeg grater). Nutmeg is a traditional ingredient in mulled cider, mulled wine, and eggnog.
Alton keeps a nutmeg in his pocket.