Put the milks and syrup into a large saucepan. Whip the egg yolks until lemon yellow. Turn the heat to medium and cook until it begins to get hot a little steam coming from it. Temper your yolks with some of the milk be sure it isn't so hot like scalding that is too hot. Just add a little of the med hot milks to the yolks while you whisk them quickly so you do not cook the eggs too fast. Now dump into the whole pot of milk and syrup. Cook until very hot at this point.
Meanwhile this is cooking whip the egg whites in a large bowl until stiff not totally peaks though. Once the milk is hot enough to cook the eggs thoroughly start pouring a slow steady streak in the eggs whites while you continue to beat the egg whites so the milk will cook the egg whites but not make lumps in the custard. Add your vanilla bean and taste if you need more add it.
Refrigerate overnight! It will be very creamy already and yummy to eat a little while it is warm too, but save most of it for the ice cream.
ok it is the next day now. Pour the creamy mixture into your ice cream container and process for about 15 to 20 minutes this depends on your ice freezer. I use a Kitchenaid and it takes 15 minutes on Stir.