Heat the oil in a wide pan. Sauté the ginger, garlic, chilli and spices for 1-2 mins. Add the sweet potatoes and cook for a further 2 mins. Add the coconut milk, tomatoes and water, simmer everything for approx. 15 mins. Add the quinoa and lentils, simmer for a further 30 mins. until the quinoa and lentils are soft and the sauce has thickened. Season the curry with salt.
To serve & garnish
Plate up the curry, garnish with yoghurt and coriander.