Mix egg yolks, 2 cups sugar, rum, and nutmeg together in a large bowl. Cover with plastic wrap and refrigerate 8 hours to overnight to “cure.”
Beat egg whites and remaining 1 cup sugar in a bowl using an electric mixer until firm peaks form. Fold in heavy cream. Fold in the egg yolk mixture. Beat in half-and-half until well combined. Pour into lidded jars or containers, refrigerate, and shake before serving.
Make sure you use a big bowl that will hold a gallon for mixing.
This recipe contains raw egg. We recommend that pregnant women, young children, the elderly, and the infirm do not consume raw egg. Learn more about egg safety from our article, How to Make Your Eggs Safe.
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