Recipe from New York’s Dead Rabbit and adapted by The Duke of Clarence.
Use a filter coffee that is a mild blend and not too over powering – ie espresso is too strong for it and will drown out the whiskey, too weak and you’ll get nothing. Grind of the coffee should be coarse like black pepper.
Coffee should be at 78.5 degrees Celsius. The cream should have a fat content between 35 to 38%. Whip the cream to have the consistency of pancake batter — not too thin, not too heavy. The cream should be super cold.