Meanwhile in a saucepan heat milk to a simmer, gradually pour one third of the hot milk into the egg mixture, whisking all the time,pour mixture back into saucepan still whisking,scraping sides to keep smooth.Cook over low ro medium heat until it begins to thicken and bubble cook 60 seconds more. Pour into a bowl press parchment paper on surface of pastry cream to prevent a skin and chill until cold. This can be done a day or two in advance.