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Preheat oven to 200°C.
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To make the red pesto dressing, place capsicum halves, skin side up, on a baking tray and brush with 1 tablespoon of the olive oil. Roast for 30 minutes or until tender and skin has blackened.
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Remove from oven and place in a sealed paper bag to cool. Once cool, peel and discard the skin and coarsely chop the capsicum.
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Place cashews in a food processor and process until coarsely chopped.
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Add capsicum, chillies, remaining olive oil, parmesan, garlic and oregano. Process to a paste consistency, season with salt and set aside.
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Reduce the oven temperature to 180°C. Place onions on a shallow sided baking tray, add oil and toss to combine.
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Bake for 10 minutes or until softened, stirring occasionally. Stir chorizo through onions and continue roasting for 15 minutes, stirring occasionally.
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Into a pot of boiling salted water, add the pasta and cook as per packet directions. Drain well and place in a large serving bowl.
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Add pesto and chorizo/onion mixture and stir to combine. Add tomatoes and rocket then toss gently to serve.