Spicy peanut chicken stew

Name: Spicy peanut chicken stew
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)