Add the diced onion and cook while stirring occasionally until it softens and becomes translucent.

Stir in the minced garlic and cook briefly, making sure to stir gently so it does not burn.

Pour in the crushed tomatoes and mix well so the base of the sauce is evenly combined.

Add the oregano, basil, salt, pepper, and sugar if using, then stir to distribute the seasonings evenly.

Bring the sauce to a gentle simmer, allowing the flavors to begin developing gradually.

Reduce the heat and let the sauce cook slowly, stirring occasionally to prevent sticking and deepen flavor.

If the sauce becomes too thick, add a small amount of water gradually until the desired consistency is reached.

Taste the sauce and adjust seasoning as needed before serving.

Serve over freshly cooked spaghetti or use in your favorite dishes.