Preheat the oven to 200°C.
Peel and cut the sweet potatoes into bite-sized cubes and cut the onion into wedges.
Arrange the chopped vegetables in a baking dish, drizzle with oil, season with salt and pepper, then bake for about 25 minutes.
Meanwhile, cook the lentils according to the packaging instructions and drain.
Crush the cumin seeds.
Cut the halloumi into 1cm thick slices, sprinkle these with the crushed cumin then fry in a hot pan or griddle pan. Set aside.
Transfer the cooked vegetables into a serving dish, sprinkle it with the spinach leaves, scatter the pomegranate seeds over and toss with the oil & vinegar.