Simple Tomato Sauce

I've seen this recipe on several food blogs.  It is super simple, but everyone said that it didn't need all the herbs that are missing from most tomato sauces, so I thought I'd give it a try.  Unfortunately we didn't care for this.  It wasn't bad, but it was thin and lacking in flavor.  And with 5 tablespoons of butter it just wasn't worth the calories.  But for the sake of documentation I'll post it anyway!

Simple Tomato Sauce
From Essentials of Italian Cooking by Marcella Hazan via Annie's Eats

1 (28 oz.) can whole peeled tomatoes, with juices
1 onion, peeled and halved
5 tablespoons unsalted butter
Salt, to taste

Combine the tomatoes, onion, and butter in a medium saucepan over medium heat.  Bring the mixture to a simmer, then reduce the heat to keep the sauce at a low, steady simmer for 45 minutes.  Stir occasionally, crushing the tomatoes against the side of the pot with a wooden spoon.  Remove from the heat, discard the onion, and add salt to taste.  Serve warm with pasta. 

Note: I used a potato masher to crush the tomatoes.