Traditional Spaghetti all'Amatriciana

Ingredients (11)

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