Drink coffee with a burned charcoal inside
You can find this in Jogjakarta, Indonesia. I have tried twice, a sweet coffee with a burned charcoal inside, very good I think and only for US$ 0.2 or less than 2000 rupiahs. The “warung angkringan” here is one of the favorite place for hanging out or for having some meal. Located next to “Tugu” train station.