Mix all the ingredients together (except peppers, salt and lemon). Place in the fridge for at least an hour. If you are using wooden skewers, now is also a good time to put them in water. Cut the peppers into rough chunks. Heat up the griddle pan on a medium-high heat. Thread the peppers and chicken in whichever combination you wish. Grill until chicken is cooked through, remove from the heat and generously season with salt and lemon juice.