Ingredients
1 (28-ounce) can whole tomatoes, no salt or herbs added
5 tablespoons unsalted butter
1 small white onion, peeled and cut in half
Kosher salt
Cooked pasta
Shaved Parmesan cheese
Cooked pasta
Instructions
Place the tomatoes, butter, onion halves, and a pinch of salt in a large saucepan and bring to a simmer over medium-high heat. Lower the heat to maintain a gentle simmer and cook, stirring and crushing the tomatoes lightly with the back of a spoon occasionally, until droplets of fat appear on the surface of the tomatoes, about 45 minutes. Remove and discard the onion. Serve over hot pasta with Parmesan and black pepper, if desired.