* 300g Milk
* 3 Egg yolks
* 75g Icing sugar
* A few drops of vanilla essence

===Method===
* Combine the egg yolks and sugar in a stainless-steel bowl.
* Whip until thick and light.
* Scald the milk in a boiling-water bath or over direct heat.
* Very gradually pour the scalded milk into the egg yolk mixture while stirring constantly with the whip.
* Set the bowl over simmering water.
* Heat it slowly, stirring constantly, until it thickens enough to coat the back of a spoon (or until it reaches 185°F/85°C).
* Immediately remove the bowl from the heat and set it in a pan of cool water.
* Stir in the vanilla.
* Stir the sauce occasionally as it cools, to avoid it forming a skin.

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