Method
- Preheat oven to 200°C / 400°F / Gas mark 6.
- Line a loaf tin with baking parchment so that it comes up the sides.
- Using a mandolin slicer or fine grater on your food processor, thinly slice the peeled potatoes length ways. Pat dry the potatoes with paper towels.
- Place the sliced potatoes in a large bowl. Using your hands, toss with the melted margarine and oil, 2 teaspoons salt, black pepper and about 2 teaspoons of chopped rosemary until fully coated. Hold back the remaining salt & rosemary for garnish.
- Carefully place the potatoes upright, from left to right, in the prepared loaf tin until full. Do not pack in the potatoes too tightly, as this impacts the crispiness.
- Bake for an hour, or until the potatoes are golden and crispy.
Garnish with the remaining salt and the rosemary. Serve immediately