Step 1 Place the potatoes in a large saucepan and cover with plenty of cold water. Bring to the boil over high heat, then reduce heat to medium-high and cook, uncovered, for 10 minutes or until just tender. Drain and set aside for 5 minutes to cool.
Step 2 Meanwhile, place the salt, coriander seeds, cumin seeds and chilli flakes in the bowl of a mortar and pestle or a small blender. Pound or blend to a coarse powder. Add the nutmeg and pepper, and mix well to combine.
Step 3 Place the spice blend in a large non-stick frying pan over medium heat and cook, stirring, for 3-4 minutes or until aromatic. Transfer to a bowl and set aside for 5 minutes to cool.
Step 4 Preheat oven to 230°C. Cut the potatoes in 1/2 and place on a large baking tray. Drizzle with the oil and sprinkle with 50g (1/4 cup) of the spice blend. Toss to coat in the spice blend. Roast in preheated oven, turning every 5 minutes, for 20 minutes or until crisp and tender.