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Heat the olive oil in a saucepan over medium heat.
Add the diced onion and sauté until soft and golden, about 5–7 minutes.
Stir in the tomato paste and cook for 1 minute to release its aroma.
Add the grated tomatoes and stir well. Reduce heat to low and let simmer for 10–15 minutes until thickened.
Season with salt, pepper (if using), and stir in the fresh parsley. Simmer for an additional 2 minutes.
Meanwhile, cook the spaghetti in a large pot of salted boiling water according to package instructions until al dente.
Drain the pasta and combine with the sauce, tossing to coat evenly.
Serve immediately, topped with grated cheese if desired.
Serving and storage tips:
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