Blitz paste ingredients in a blender, adding enough cold water to make a smooth paste. Heat the oil in a wide pan until smoking hot, add the paste and cook, stirring, for eight to 10 minutes, until dry.
Add chicken, veg and seasoning ingredients, and stir-fry until chicken is cooked. Add peanuts and, off the heat, basil. Garnish with spring onions; serve with steamed jasmine rice.