Tomato Sauce using Canned Tomatoes

I wanted to post this recipe because it is a very delicious, yet simple and easy tomato sauce recipe, made from canned tomatoes.  I use it a lot!  I am going to make cabbage rolls again this weekend and will use this tomato sauce.  It is from "The Big Book of Pasta." 

Here it is:

Tomato Sauce
5 tbsp olive oil (use the full amount!)
1 onion, finely chopped
1 can chopped tomatoes
4 garlic cloves, sliced
large handful of fresh basil leaves, chopped
-or-
large handful of fresh parsley, chopped
salt and pepper

Heat oil in large pan over medium heat.  Add the onion and cook for 5 minutes, until soft.  Add the tomatoes and garlic.  Bring to a boil, then simmer over low heat for 30 minutes, or until the oil separates from the tomato.  Season with salt and pepper.  Add in the basil or parsley.