Tomato sauce with butter and onion (Kopie)

*****
(serves 4)
2 x 400g chopped tomatoes
1 onion, peeled and chopped into half
70g unsalted butter
Salt to taste

1. Peel the onion and chop in half. Place in a saucepan with chopped tomatoes and butter.

2. Bring to the boil and simmer for 45 - 60 minutes.

I was hoping to get a slightly smoother sauce than the cooking produced so I whizzed it in a food processor briefly to get a silkier texture.

http://www.londonbakes.com/2011/03/tomato-sauce-with-butter-and-onion.html