By Sri Owen
Soak the duck in vinegar for 2 minutes, then wash and dry. Put in a large saucepan with the onion, which should be cut into big chunks, the stick of cinnamon, and some salt. Cover with water, bring to the boil, and simmer for 1 hour. Allow to cool, then take out the duck, strain the stock, and remove all the fat.
Pound together the shallots, green chilli, and ga