Begin by heating a generous amount of olive oil in a large saucepan.

Add finely chopped onions to the heated oil and cook them until they become soft and translucent.

Introduce minced garlic and a pinch of chili flakes to the onions and sauté for an additional 2 minutes, allowing the flavors to meld together.

Pour in the canned tomatoes and tomato puree, followed by a sprinkle of salt and pepper, enhancing the taste to your liking.

Allow the mixture to simmer for about 45-50 minutes over low heat. This will bring the flavors together and thicken the sauce to perfection.

Just before serving, stir in a handful of fresh basil leaves, and if necessary, adjust the seasoning to suit your taste buds.