step 1
Beat the egg yolks and sugar for a few minutes until pale and slightly thickened.
step 2
Whisk in the flours.
step 3
Heat the milk in a saucepan until stating to boil.
step 4
Whisk the milk into the egg mix.
step 5
Put the whole lot back into the pan, stirring all the time until thick and boiling.
step 6
Take the pan off the heat - cover with cling-film to prevent a skin from forming.