Combine the coffee and water in a saucepan, bring to a boil, and boil for 10 minutes.
Strain through a fine-mesh sieve set over a bowl, then return the weight of the liquid to 4 lb/1.81 kg by pouring additional hot water through the coffee grounds.
Combine the sugar and 1 lb/450 g of the coffee mixture in a saucepan and bring to a boil, stirring to di