INGREDIENTS
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1 tablespoon extra virgin olive oil
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¼ white onion, finely sliced
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2 medium potatoes, peeled and diced
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1 tablespoon of tomato puree
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600 ml of boiling salted water
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100 g short pasta
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50 g of crust of Parmesan cheese, cubed
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Red hot chilli pepper or freshly ground black pepper and grated Parmesan cheese to serve