Heres a tip for cooking the centre but im sure you all know it anyway - after you have made your little ball of Bhaji and put it in the oil - cook it for a couple of mins or less depending on the temperature - then take out and let drain - let it cool - when you can touch it open the centre slightly with your fingers then squash it between your hands or on a flat surface - then refry for a min - DONE! with centre cooked
best, Rich