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1
Place the reserved egg whites in a very clean and airtight container and freeze until the eggnog is ready to serve.
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2
Combine the yolks and sugar in a large bowl and whisk until well blended and creamy.
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3
Add the the remaining ingredients and stir to combine.
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4
Transfer the mixture to a 1-gallon glass jar and tightly seal the lid.
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5
(Alternatively, you can .)
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6
Place in the refrigerator for at least 1 week and up to 3 weeks.
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7
The night before serving, place the frozen egg whites in the refrigerator to thaw.
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8
When ready to serve, let the egg whites come to room temperature.
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9
Place the egg whites in the very clean bowl of a stand mixer fitted with a whisk attachment.
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10
Whisk on high speed until stiff peaks form, about 2 to 3 minutes.
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11
Remove to a large punch bowl.
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12
Place the cream in the stand mixer bowl (no need to wash the bowl) and whisk on high speed until medium peaks form, about 1 to 2 minutes.
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13
Remove to the punch bowl.
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14
Stir the eggnog base with a rubber spatula to re-combine, then add it to the punch bowl.
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15
Gently whisk the eggnog together until just combined and no large pockets of whites or cream remain (do not overwhisk or youll deflate the eggnog).
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16
Serve in punch cups over ice, if desired, and garnished with grated nutmeg.