Preheat the oven to gas 7 / 220C / 425°F and line a baking tray with greaseproof paper
Put the sweet potato, onion and garlic on the tray and drizzle with oil. Bake for 20 minutes
Add the tomatoes and bake for another 10 minutes. While this is going on cook the pasta, go by the instructions on the packet
Add the asparagus to the pasta for the last 2 - 3 minutes of cooking time. Drain and return to the pan
To the pan add the roasted veg (not garlic yet), sugar, parsley, lemon juice, olive oil and squeeze the roasted garlic out of the skins in
Season with pepper, mix gently and serve, yum!