2 cups granulated sugar
½ cup unsalted butter
¾ cup eggnog
Pinch salt
10½ ounces white chocolate, chopped
½ teaspoon freshly grated nutmeg, plus a little more for dusting the top of the fudge
1 (7-ounce) jar marshmallow creme
1 teaspoon rum extract

Line an 8-inch square pan with parchment paper and let it hang over the side; set aside.  In a heavy 3-quart saucepan, combine the sugar, butter, eggnog and salt over medium heat. Bring to a rolling boil, stirring constantly. Continue boiling 8 to 10 minutes, until a candy thermometer reaches 234 degrees°, stirring constantly to prevent scorching. Remove from heat.  Using a wooden spoon, work quickly to stir in chopped white chocolate and nutmeg until chocolate is melted and smooth. Stir in marshmallow creme and rum extract. Beat until well blended and then pour into the prepared pan. Sprinkle a little freshly ground nutmeg on top. Let stand at room temperature until cooled, then refrigerate overnight until firm.