Heat half the oil in a large frying pan over medium heat. Place half of the patties in the pan, moving them around in a circular motion as you put them down (to prevent them from sticking to the pan). Cook for four to five minutes on the first side and then flip and cook for another four to five minutes. Remove to a plate. Add the remaining oil and repeat for the other patties. If your pan is large enough, you can cook these in one batch.