Asian grocers, fresh or frozen; sometimes labelled laos, kha or lengkuas.
1Frozen galangal
The same weight
You lose very little — it freezes well, and slices straight from frozen.
2Dried galangal
Simmered or pounded into a paste
About a quarter of the weight, soaked in hot water for 30 minutes
You lose some of the bright, piney top note.
Three-quarters of the weight
You lose galangal's sharp, camphor-and-pine bite; ginger is warmer and sweeter.
Gets some back a strip of lime zest and a few cracks of black pepper.