Preheat the oven to 200°C conventional (180°C fan-forced). Rub the sweet potato rounds with the olive oil and moroccan spice. Place on a large roasting tray and bake for 25–30 minutes until cooked through and golden. Set aside to cool.
Dollop the sour cream onto a serving plate and use the back of a spoon to spread it to the edges. Arrange the sweet potato rounds on the sour cream, piling them up nice and high in the centre.
300 ml sour cream, 3 sweet potatoes
Mix the yoghurt and tahini in a small bowl until combined. Dollop on top of the sweet potato. Scatter over the pistachios, pomegranate and mint.
2 tablespoons greek yoghurt, 1 tablespoon tahini, 1/4 cup pistachios, 1/2 pomegranate, 2 tablespoons mint leaves
To serve, sprinkle over a little sumac, squeeze over some lemon wedges and season with pepper.