Whisk egg yolks in an electric mixer until lightened in color. Slowly add sugar, beating after each addition, whisking until fluffy. Slice vanilla bean and scrape seeds into egg-sugar mixture, mixing until incorporated; reserve rest of vanilla bean. Combine milk, 1 cinnamon stick, cloves and remaining vanilla bean in a thick-bottomed pan. Slowly heat until the milk is steaming hot but not boiling. Slowly whisk about ¼ cup of the hot milk mixture into the egg yolks to temper them; add slowly so as not to scramble the eggs. Pour egg mixture back into the saucepan of milk. Cook over low heat, stirring constantly with a wooden spoon, until the mixture thickens coats the spoon. (This is usually around 160 degrees on a candy thermometer.) Remove from heat and stir in cream and nutmeg. Strain mixture through sieve then cover and refrigerate to chill for at least 1 hour. Serve garnished with a fresh grating of nutmeg and cinnamon (from the remaining cinnamon stick. Optional: Stir in 2 oz. of brandy per serving for a boozy version and/or fold in or top with beaten egg whites to for a fluffy version.