Butter a baking sheet and sift confectioner's sugar over it.
Arrange marshmallows into 12 vaguely triangular shapes to form
ghosts, about 8-9 marshmallows per ghost. Bake until they melt,
about 5 minutes. Do not let them brown.
Insert 2 cloves for eyes into the top marshmallows of each
triangle. Let the ghosts cool completely on the tray before
removing them with a spatula. Combine the remaining ingredients
in a large pot and place it over medium heat until the mixture
is warm to the touch. Do not let it come to a boil.
Let the brew stand for at least 2 hours. Transfer to a punch bowl
and float the ghosts on top. Serve cold or at room temperature.
The brew can also be served hot, but the ghosts will soon vanish
into the warm liquid.