What to do:
Preheat the oven to 200°C fan. Put a large pan of salted water on to boil. Once boiling add the potatoes and cook for 4-5 minutes until cooked through. Drain the potatoes.
Add the potatoes to a large baking tray – drizzle with the 2 tbsp oil, and top with the chaat masala, turmeric and seasoning. Toss to mix thoroughly. Roast in the oven, stirring once or twice, for 35 minutes, or until deeply golden.
Meanwhile, make the coriander chutney. Put all the ingredients into a food processor or blender and blitz until smooth. Set aside.
To make the tamarind dressing, whisk together all the ingredients in a small bowl with 1½ teaspoons of water until the sugar is dissolved. Set aside.
Spread the yoghurt on a large serving platter. Top with half the coriander chutney, swirling it through without completely incorporating. Drizzle with half of the tamarind dressing, and top with the potatoes, shallot and chilli. Drizzle over the remaining coriander chutney and tamarind dressing, then sprinkle over the toasted seeds and reserved coriander leaves and serve
