Add eggnog to a small saucepan on the stove. Heat over medium. Do not boil. We just want to heat until small bubbles and steam form.
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While the eggnog heats, make some espresso. You can also substitute strong coffee or make espresso using the instant espresso powder if you don't have a machine.
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When the eggnog begins to steam and small bubbles form on the surface, turn off the heat. Grab a whisk and beat until frothy. Pour over the espresso mixture.
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