Heat the oil in a large skillet over high heat. Add the potatoes, parsley, oregano, scallions, onions, salt and pepper, stir well and then reduce the heat to medium. Using the back of a spatula, press the potato mixture to an even thickness. Cover and cook for 10 minutes, or until nicely browned at the bottom. Using a spatula, cut the potatoes into quarters to form 4 pie shaped pieces. Carefully turn over each quarter, press down, and continue cooking another 5 minutes or until browned at the bottom. Sprinkle generously with pepper before serving.