Cook potatoes for 8 to 10 minutes in a large pot of boiling water.
Put oil in a preheated tray until almost smoking.
Drain potatoes and return to pot. Sprinkle with the flour, turmeric, oregano, salt and pepper. Place a lid on the pot and shake vigorously so that potatoes are covered in the flour and spice mixture. Place in the tray and toss to coat in the hot fat. Roast for about 40 minutes.