Ingredients
28-ounce can peeled plum tomatoes, no salt or herbs added
5 tablespoons unsalted butter
1 small white onion, peeled and cut in half
Kosher salt
To serve
Shaved Parmesan cheese
Freshly ground black pepper
Preparation
Put a 3-quart saucepan over medium-high heat. Add the tomatoes, butter, onion halves, and a pinch of salt. Bring to a simmer then lower the heat. Crush the tomatoes lightly with the back of a spoon as they cook, and stir occasionally. Simmer very gently for 45 minutes, or until droplets of fat appear on the surface of the tomatoes. Remove and discard the onion.
