Add the onion, garlic, galangal, chillies and chilli powder and gently fry for 5–8 minutes ... Heat the remaining oil in a frying pan and sear the beef fillet for 3–5 minutes on all sides ...
Return the pan to a medium heat and gently fry the garlic, ginger and chilli in a teaspoon of oil for about a minute until fragrant. Return the chicken to the pan and stir in the sauce.