Heat the oven to 180C (355F).
Peel and chop beetroot and pumpkin into small pieces, approximately 5cm (2 inches). Aim for the beetroot pieces to be slightly smaller than the pumkin.
Toss in olive oil and season with salt and pepper, place on a lined baking tray and bake for around 30 minutes. Remove from oven when they are tender and pumpkin is golden.
While the vegetables are cooking, make the dressing by combining all ingredients in a small bowl and whisking. Set aside. Prepare the other ingredients.
On small serving platter, arrange the spinach and scatter with the warm pumpkin and beetroot, tomatoes, feta cheese and walnuts. Drizzle with some of the dressing, leaving the rest on the side for self serve.