tomato sauce with butter & onion

i got this recipe from smitten kitchen and she got it from someone else. the only way this sauce could be easier is if you just opened a jar. the only way it could be tastier is .... ?

just to prepare you, this is a simple and delicious tomato sauce. it's NOT the typical sweet, garlic-y and basil-y tomato sauce you might be used to, but give it a chance. the beauty is in the unadulterated simplicity. and if you don't like it, the ingredients are cheap so you won't feel too bad. ☺

28 oz can whole tomatoes (use the best quality/brand you can)
1 medium yellow onion, peeled & halved
5 TB butter

put tomatoes, onion halves and butter in a 3 qt. sauce pan. bring to a simmer (med heat), then reduce to low heat and simmer continuously for 45 minutes – or until the fat separates to the top of the sauce. stir occasionally, crushing tomatoes against the side of the pot with a wooden spoon.

serve over spaghetti or whatever pasta suits your fancy! grated parmesan totally optional – i liked it with and without.