Follow the steps in order for the best result.
Begin by heating the olive oil in a sauce pot over medium heat. Add the diced onion and minced garlic, then sauté until they become softened and fragrant.
Introduce the remaining ingredients, excluding the grated cheese, into the pot. Bring the mixture to a boil, ensuring it is well combined.
Once boiling, reduce the heat to low, cover the pot, and allow the sauce to simmer for one hour, enabling the flavors to meld together.
For a thicker sauce, stir in the 1/4 cup of grated Parmesan cheese and continue simmering for an additional 5 minutes to achieve the desired consistency and enhance the flavor.