Traditionally, Potatoes O'Brian have green Bell peppers but the appearance of the dish can be improved with a bit of red Bell pepper or some added chopped pimentos.
Prior to World War II, everyone had a little container on their stove where they poured off the bacon grease. It was the prefered grease for frying. Since then bacon and bacon fat have received more than their share of bad press. That doesn't change the fact that bacon fat adds a lot of flavor to foods. Try frying a little bacon to go with the potatoes and leave a little of the bacon fat and brown bits in the pan and then fry the potatoes.