Preheat oven to 200°C or 180°C fan. Place sweet potatoes, onions and 1 tbsp oil in a baking pan.
Toss to coat. Bake for 30 mins, or until tender. Add tomatoes and bake for 10 mins, or until tomatoes have just collapsed.
Meanwhile, cook penne in a pan of boiling, salted water according to packet directions. Drain.
Place pasta in a large bowl with remaining oil. Add vegetables, rocket and parmesan. Toss well to combine. Serve.
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