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Add vanilla to milk and bring to just under boiling
Mix egg yolks and sugar together in a bowl, add a small amount of milk and whisk
Slowly add the rest of the milk and stir thoroughly with a wooden spoon
Place into a clean pan and heat gently, stirring with a wooden spoon until the
sauce thickens enough to coat the back of a spoon.
Do not allow the sauce to boil or it will curdle and separate
Remove from the sauce and continue to stir until the sauce cools slightly
Pass the sauce through a fine strainer for use warm or chilled.