First, prepare the marinade sauce by mixing the 6 tbsp of oil with paprika, oregano, garlic granules, salt, and pepper in a bowl. Next, cut each potato into 1 cm thick rectangles. To create the accordion effect, place each potato on a chopping board with two skewers on either side, parallel to the potato. Cut small diagonal slices into the potato, then flip it over and cut small horizontal slices. Boil the prepared potatoes for 4 minutes. After boiling, place them in a baking tray and brush generously with the oil marinade. Finally, bake in a fan oven at 180 degrees Celsius for 20-30 minutes, or until golden and crispy.