I'm doing the Tai Bwo Wannai Trio quest and CANNOT seem to cook the karambwana so it is poisoned. Whether I cook it on a range or a fire it does not give me the option to cook for a "short time" or "partially" cook it. It either cooks as edible or burnt. My cooking level is 67. I can't figure this out for the life of me, I desperately need your help.