Spicy African chicken stew

Name: Spicy African chicken stew
Prep time: 15 min
Cook time: 1 h 5 min
Total time: 1 h 20 min
Cuisine: African
Ingredients: 500ml chicken stock , heated; 340g jar smooth peanut butter; 2 onions , halved and thinly sliced; 3 tbsp sunflower oil; 3 tbsp finely chopped ginger; ½-1 tsp cayenne pepper (optional); 3 tsp ground coriander; 3 tsp ground cumin; 1-2 scotch bonnet chillies, deseeded and chopped; 2 bay leaves; 400g can chopped tomato; 2 x 800g pack chicken thighs and drumsticks, skinned; 3 sweet potatoes , cut into chunks; 2 red peppers , deseeded and cut into chunks; good handful coriander , chopped, a little reserved for sprinkling; rice and lime wedges, to serve (optional)