Big Batch Spaghetti Sauce

1⁄4 cup olive oil
3 medium onions, chopped
2 cloves garlic, minced
12 cups tomatoes, peeled,cored,and chopped,approximately
3 (12 ounce) cans tomato paste
3 tablespoons brown sugar
1 tablespoon dried oregano
4 teaspoons salt
2 teaspoons dried basil
1 teaspoon dried black pepper 
Heat oil in large pan.
Saute onions and garlic until tender.
Add rest of ingredients.
Heat to boiling.
Reduce heat.
Simmer, partially covered, for 2 hours.
Stir occasionally.
After it has simmered, cool completely and store in freezer bags or containers in increments that you find best for your family; (When ready to use, thaw and heat).
Or process in a boiling covered canner for 35 minutes
Favorite ingredients can be added like sliced mushrooms, cooked/drained sausage, hamburger, etc.
This sauce is great for any Italian dish.
Great as a sauce for pasta and as a pizza sauce.
If canning should make about 4 quarts