Step 1

In a large skillet or pot, heat oil over medium to medium-high heat. Add the diced onions and saute for 10 to 15 minutes, stirring frequently. Add the garlic and saute for another 1 to 2 minutes, stirring frequently to prevent the garlic from burning.

Step 2

Add the crushed tomatoes, sugar, salt, oregano, basil, and parmesan cheese (break up any clumps before adding). Stir well. Bring to a simmer.

Step 3

Reduce the heat to medium-low, but maintain a simmer. Simmer for at least an hour to give the sauce time to cook down and thicken.

Step 4

Serve over spaghetti noodles. This spaghetti sauce pairs perfectly with my Baked Sausage Meatball recipe.