Yes, it exists! as I mentioned in some of the replies here, there's a specialized charcoal that is used for that. From what I searched in Indonesian marketplace, they are using sour wood mostly and ceylon oak. So, it's not like you can chop any wood and use it. Even here there's ongoing debate about it but since its own tourist attraction, I guess the food safety agency just kind of OK it and plus it's often sold on the road side too. You'll have to research it more and it'll be interesting if you could have it there :D
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I was about to drop some of my charcoal pencils in a cup of warm water. Maybe better not to try that first 😂
hahahaha yeah, don't do that. But yeah, you also need them to be like burning charcoal and then when you dunked into the coffee, it made sizzling sound.
☕