1To make the papelon syrup, place the papelon and water in a small saucepan over medium heat and stir until dissolved. Bring to a boil and simmer, without stirring for 2 minutes to thicken slightly. Cool, then transfer to an airtight jar or container.
2Place the cold brew, lime juice and 1¾ fl oz of the papelon syrup in a liquid measuring cup and stir to combine.
Tip: Store the remaining papelon syrup in an airtight container in the fridge for up to 3 months.
3Fill a tall serving glass with ice and pour over the coffee mixture. Garnish with a lime slice to serve.