Josephine, I extra OJ and zest to eliminate the porky odor. It is just my own preference. You are able to just omit it.The Tuna Rice Ball is wetter and richer in flavour. It comes with flakes of tuna with mayonnaise and fried kimchi, seaweed crumbs and crushed chilli padi atop a few combined grains; medium-grain white rice stained purple from Korea