Spaghetti Sauce aka Marinara Sauce from Canned Tomatoes

1 Tbs olive oil
1 onion, diced
2 cloves garlic, minced
1 30 ounce can tomato puree
1 15 ounce tomato sauce
1 Tbs sugar
1 tsp Italian seasoning mix (this varies depending on the mix you use so taste it!)
1/4 tsp red pepper flakes
1/4 cup red wine

Heat the oil and saute the onion until soft. Add the garlic and cook a few minutes, stirring frequently. Add the tomato puree, sauce, sugar, Italian seasoning, red pepper and wine. Simmer 30 minutes or more over very low heat, stirring now and then.

I use this for spaghetti and meatballs, and pizza.