1. Cook macaroni according to packet directions. Drain and run under cold water. Set aside.
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2. Meanwhile, heat oil in a large pot over medium heat. Fry onion and bacon until onion is softened. Add garlic, stirring for 1 minute or until aromatic.
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3. Add oregano, tomatoes, soup, paste and macaroni to pot. Season to taste with salt and pepper. Stir vigorously until combined. Stir in cheese until melted through. Check for seasoning.
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4. Reduce heat to low, pop a lid on and simmer for about fifteen minutes.
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5. Serve, piled high in bowls with lots of parmesan.