How to Make It
Heat 1 1/2 inches water in a large saucepan until simmering. Combine milk, salt, and nutmeg in a large metal mixing bowl, and place over simmering water until mixture is hot.
Stir polenta into hot milk mixture, whisking until blended. Cover with foil, and cook over medium-low heat 1 1/2 hours. Uncover and stir in butter and Parmesan cheese.