20 whole cloves
5 cinnamon sticks
1 cup water
1 gallon cold milk
1/4 cup instant coffee granules
1 cup white sugar
1 tablespoon vanilla extract (optional)
1 cup pisco, white rum, brandy, or other lightly-flavored liquor (optional)
Gently simmer the cloves and cinnamon sticks in water until reduced by half, about 30 minutes. Add 1 cup of milk, and heat to a simmer, then stir in and dissolve the coffee and sugar.
Strain the coffee mixture into the remaining cold milk, and discard the cloves and cinnamon sticks. Stir in the vanilla extract and pisco. Store in the refrigerator.