----MAKES ABOUT 750 G / 1 3/4 LB----
6    Egg yolks
125 g  Sugar (5 oz)
40 g  Flour ( 1 1/2 oz)
5 dl Milk (18 fl oz)
1    Vanilla pod, split
Icing sugar

(Basic custard cream filling for innumerables patisseries)

Put the egg yolks and about one-third of the sugar in a bowl and whisk
until they are pale and leave a slight trail when you lift up the whisk.
Sift in the flour and mix well.

Put the milk, the remaining sugar and the split vanilla pod in a saucepan
and bring to the boil. As soon as the milk begins to bubble, pour about one
third on to the egg mixture, stiring continuously. Pour the mixture back
into the pan and cook very gently, stiring continuously, until the custard
thickens (1-3 minutes), then pour it into a bowl.

Sprinkle some icing sugar over the surface to prevent a skin forming as the
custard cools.