Cut chicken into 1cm slices and marinade with 1tbs fish sauce, 1tsp sugar and pepper.
In a mortar and pestle grind lemongrass, shallots, garlic and chilli into a fine paste.
Fry the paste ingredients for 2min then add chicken and stirfry until golden brown.
Add splash of water and stir, then cover for a minute.
Uncover and cook until the water has evaporated into a thick sauce and the chicken is tender.
Add crushed peanuts and serve with rice and raw vegetables i.e. carrots, cucumber, tomato.
