To serve iced, dissolve a tablespoon of instant coffee and 2 tablespoons of the rempah syrup in a glass with a tablespoon of hot water. Mix well until the coffee is dissolved.
Pour in 1/2 cup of cold water and mix until combined.
Top with ice and coconut milk to taste.
To serve hot, dissolve a tablespoon of instant coffee and 2 tablespoons of syrup in 1/2 cup of hot water. A milk frother does the job well, but you can also just use a spoon.
Gradually mix in the coconut milk until your desired flavor and color appear.
Pour into coffee mugs and enjoy!