"I was really never a fan of eggnog... until a friend gave me this proven recipe. It's simply the best! It's rich and creamy, just like melted vanilla ice cream. This makes almost a gallon and packs a punch... so drink responsibly."
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.