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Wash and parboil the potatoes for 5-6 minutes in salted water. Drain. Meanwhile, preheat the oven to 200°C/180°C Fan/Gas Mark 6. After 5 minutes, add the oil to a large roasting tray, then place in the oven to heat until the oil is very hot.
‘Smash’ the cooked potatoes with the back of a spoon, so the potatoes are split. Add the herb and spice mixture to the potatoes and mix well, coating all the potatoes with it.
Take the roasting tin out of the oven and add the potatoes, turning them over in the hot oil so that they are all coated.
Roast for 30-35 minutes until the potatoes are crispy and golden, shaking the roasting tray three or four times during cooking to ensure they cook evenly for an all-over crispness.