To begin, preheat your oven to 200°C. Place the pumpkin onto a lined baking tray, Sprinkle with the cumin and drizzle with olive oil, and season with salt and pepper. Roast the pumpkin for around 20-25 minutes or until it's soft and slightly caramelized. Once the pumpkin is done, set it aside to cool.
While the pumpkin is roasting, you can prepare the harissa yoghurt dressing. In a small bowl, mix the Greek yoghurt, harissa paste, lemon juice, and a pinch of salt. Taste the dressing and adjust the seasoning to your liking. You can also adjust the spiciness of the dressing by adding more or less harissa paste. I also added a few small drops of harissa around the salad when serving (but I do love harissa, and you may like to keep things milder).
Bring a pot of salted water to the boil. Cook for the beans for 2 minutes and then refresh in cold water to stop the cooking process. Drain.
Once the pumpkin is cooled, you can start assembling the salad. Begin by placing a bed of leaves onto a serving platter or bowl. Next, add the roasted pumpkin and beans on top of the leaves. Finally, drizzle the harissa yoghurt dressing over the salad and serve topped with the toasted nuts.