WHAT YOU DO
Step 1. First, prepare the make ahead coffee and sugar mix. To make a cold brew, put a litre of cold water into a large jug and add 600g of coarsely ground coffee. Do not stir. Leave to steep for 24 hours, then strain and reserve for your drinks. To make a rich sugar syrup, dissolve 500g of Demerara sugar in 250ml of hot water. Allow to cool. Mix your coffee and sugar syrup at a ratio of 4:1. This will hold in the fridge for a week.
Step 2. To make your Irish coffee, reheat your coffee mix. Add your whiskey to the glass, then your coffee.
Step 3. Using a spoon, float your whipped double cream on top. Garnish with freshly grated nutmeg, then serve.
Recipe by Dave Mulligan of Bar 1661, photo by Ruth Calder-Potts