Scald milk in top of double boiler. Add sugar and stir until dissolved. Cool. By spoonful, add ¬ cup hot milk to beaten eggs. Slowly pour egg mixture into remaining hot milk in a fine stream, stirring constantly. Return mixture to double boiler and cook, stirring until mixture thickens slightly and coats the spoon. Remove from heat and chill thoroughly (overnight). Add cream and vanilla and pour into ice cream maker.