Start a kettle boiling.
Separate the egg.
Beat the egg white, ideally to soft peaks.
Pour the hot water into two mugs to warm them up.
Beat the egg yolk with the sugar. Fold in the white. Pinch a bit of allspice or ground clove in there if that is how you roll.
Pour the water out of the mugs. Divide the batter, the brandy, and whatever is left of the rum between the mugs. Stir.
Either top each of the mugs with hot water or bring 12 ounces of milk to a simmer and top with em that.
Top with nutmeg.
