MARINADE:. Marinating it for longer (up to 24 hours) will increase its flavour. Mix all the marinade ingredients together and set aside. Heat 1 tbsp oil in a heavy-based pan and fry the onion over a medium heat for 5 mins until softened, but not coloured. Remove from the heat, cool and combine with the marinade in a large bowl. Add the chicken and stir to coat. Cover and marinate in the fridge for at least 30 minutes.