You can't start a thread like this without spilling the recipe.
Here is my Italian grandmother's recipe for "gravy".
Garlic and onions, sauteed until the onions are translucent
1 large can (industrial size) of stewed tomatoes, each one squished through your fingers. (one secret she never told anyone is that she removed the seeds tediously before this step, which eliminated any kind of heartburn.)
2 small cans tomato paste
Parsley, salt, oregano, pepper, basil, bit of sugar, and a tiny pinch each of clove and nutmeg.
Let it simmer, the longer the better.