Combine water, sugar, ginger, lemongrass, cardamom, star anise, and black pepercorns in a sauce pot and simmer for five minutes. Leave to cool and strain.
Peel the pears and put in a sous vide bag together with the spiced ginger syrup.
Poach in a water bath pre-heated to 180F for two hours.
Submerge the cooked pears in an ice bath.
Transfer poaching liquid into a sauce pot. Add gelatin and heat until near boiling.
Pour gelatin into a mold and refrigerate to set
Serve poached pears with jelly and light syrup or ice cream.