Traditional Spaghetti all'Amatriciana
Ingredients:
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1 pound spaghetti
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3 tablespoons extra-virgin olive oil, divided, or more if needed
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1 onion, finely chopped
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7 ounces pancetta bacon, diced
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2 cups passata (crushed tomatoes)
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1 tablespoon water, or more as needed
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½ teaspoon white sugar
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2 tablespoons grated Parmesan cheese
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1 pinch red pepper flakes, or to taste
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salt and freshly ground black pepper to taste