Bring 35.20 fl oz of milk to the boil, add cocoa and sugar, then lower the heat.
Reduce the chocolate for 10 minutes or more, depending on the desired consistency. Next, let it cool.
In the meantime, prepare the coffee. Then, put the ice in a cocktail glass, mix the cold chocolate with 1.8 fl oz of milk, and pour the mixture onto the ice. Pour the coffee and top with whipped cream.