Preheat oven to Gas Mark 6.
Add the potatoes to a baking tray and roast in the oven for 30 minutes.
Add all the ingredients for the mint chutney to a blender and blend.
Add the black beans to a pan with a drizzle of olive oil, chaat masala, cumin, coriander and cinnamon powder and bake for 3-5 minutes over a medium heat.
Combine the date syrup and tamarind paste in a small bowl.
Dry toast the sunflower seeds in a pan for a minute over a medium low heat and remove from the heat.
Combine the sweet potatoes and black beans in a large plate. Pour over the mint chutney and date and tamarind paste. Sprinkle over the toppings.