Notes from the roastery

Ratio, water temperature, tamping, and how to fix a phin that drips too fast or too slow.

The world's two main coffee species, and why Vietnam is famous for Robusta.

Coffee's four enemies, why the fridge is a bad idea, and how long it keeps.

All it takes is coffee, cold water, a jar and 12–18 hours of patience.

Why the same beans taste great in a phin but bitter in a machine: it's the grind.