https://www.foodandwine.com/recipes/coffee-milk-punch-cocktails-2011
Original Recipe (makes 30!)
Scaled recipe (makes 8)
Method
Stir milk into coffee grounds
Leave in fridge for 24h
Strain and warm
Dissolve sugar in lemon juice
Stir in the rum, Bénédictine, Luxardo and nutmeg
Pour in milk and let curdle
Strain
Serve on ice