Preheat oven to 135°C
Grind the sugar, the galangal, the cocoa powder and the cinnamon to a powder and empty into a bowl
Line a baking tray with a baking sheet
Toss each slice of the pear in the spice mix and lay out on the baking sheet
Bake for an hour (or a little more), until the slices are almost dry
Flip the slices over, about half way into the baking process, so that they bake evenly on both sides
The slices will become crisp when they cool
