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In a medium bowl or the bowl of your electric mixer combine eggs, yolks and sugar, whisk to combine.
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Place your mixing bowl over a pan of hot water over low heat and stir continuously until it reaches 165°F.
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I like to start the water off at well below the boiling point and slowly raise the temperature until it's just shy of boiling.
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Do not whisk this mixture too much at this stage or you will incorporate too much air and take too long to heat.
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If water starts to boil or you see steam coming off your mixture remove from the heat for a few seconds and whisk.
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Getting this mixture too hot will cause eggs to cook.
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After desired temperature is reached, use the whip attachment for your electric mixer and beat on high speed until thick and cooled to just warm to the touch.
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Beat in vanilla and optional bourbon, serve ASAP.
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The mixture will keep in the fridge for a day or so before it starts to separate.
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Variations: Use rum, flavored liqueur or various extracts in lieu of bourbon.