Marcella Hazan's Tomato Sauce With Onion & Butter Recipe on Food52
"The most famous tomato sauce on the internet, from Marcella Hazan's Essentials of Classic Italian Cooking. Editor's note: Marcella called for 2 cups of tomatoes when using canned, but feel free to use a whole 28-ounce can (closer to 3 cups), if you like. You can scale up the butter and onion, if you like, or don't—it's genius either way...."
INGREDIENTS
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2 pounds fresh, ripe tomatoes, prepared as described below, or 2 cups canned imported Italian tomatoes, cut up, with their juice
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5 tablespoons butter
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1 medium onion, peeled and cut in half
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Salt to taste
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fresh, ripe plum tomatoes (or other varieties, if they are equally ripe and truly fruity, not watery)