Start by whipping some light cream. 

Mix a teaspoon of good Irish cream liqueur into the whipped cream. 

Place a large teaspoon of brown sugar at the bottom of the glass and pour over with good, strong coffee. 

Stir until the sugar is dissolved. 

Add 4 cl of good Irish whiskey, and stir gently again. 

Then carefully place the whipped cream on top of the coffee. 

Sprinkle a very small amount of cinnamon on top of the whipped cream. 

Drink the hot coffee through the cold whipped cream (straws and teaspoons are completely banned).