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Set up a double boiler. Put two yolks, vinegar and tarragon into the glass bowl on top and whisk.
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When water boils, turn it down. Stir CONSTANTLY.
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When the mixture starts to thicken, add one cube of butter t a time, mixing after each addition until melted.
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When done, quickly take off the heat and plonk the bottom of the bowl into cold water to stop it from cooking.
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Make sure that you have a big bowl of cold water on hand so if you think the eggs are going lumpy or about to curdle, put the bottom into the water and whisk vigorously.