Spaghetti Sauce

-1 cup red onion, diced
-1 15oz can Tomato Sauce
-1 14.5oz can Diced Tomatoes
-1 6oz can Tomato Puree
-1T fresh chopped Basil
-1 clove of Garlic
-1 tsp each: dried Parsley, Oregano, Thyme
-1/2 tsp garlic salt