Method
1 To make the dressing, combine all ingredients in a screw-top jar and shake well.
2 Combine sweet potato and oil in a medium baking dish, season with salt and pepper.
3 Cook in a moderate oven (180C) for about 25 minutes or until sweet potato is tender.
4 Meanwhile, cook pasta in a large saucepan of boiling, salted water for about 12 minutes or until just tender. Drain well.
5 Gently combine pasta, sweet potato, avocado, baby spinach leaves, tomatoes and dressing in a large bowl. Season with salt and pepper.
6 Serve salad topped with shaved parmesan cheese.