The fragrant caramel scent from a coffee roasting machine in the corner of the living room filled the house in the Buncit Indah complex, West Pejaten, South Jakarta. In early March, the operator, Ratna Yuriasari, was busy watching the shiny black machine roaring endlessly.

Ratna pulled a brown lever on the side of the machine several times to check the readiness level of the coffee being roasted. Occasionally she checked the time marker and jott