Pound or blend shallots, candlenuts, garlic and ginger into a fine paste.
Boil chicken in water with a pinch of salt until cooked (10–12 minutes). Cool, then shred finely. Reserve ¼ cup stock if needed.
Heat oil in a wok over medium heat. Fry the paste with crushed lemon grass stalk and kaffir leaves until fragrant and lightly browned (5–7 minutes).
Add salt, sugar, pepper, and coriander. Stir well.
Add shredded chicken and cook over low heat until dry, moist, and aromatic (8–10 minutes). Cool completely.
Remove lemon grass stalks and kaffir leaves