Taken from: http://sundaypasta.com/sunday-pasta-penne-al-sugo-di-pomodoro-tomato-sauce/
Sunday Pasta: Penne al Sugo di Pomodoro (Tomato Sauce)
Ingredients
Serves 4-6
1 onion finely chopped
1/3 cup olive oil
1 28-ounce can peeled plum tomatoes puréed
1 teaspoon salt
1/2 teaspoon freshly ground black pepper
4-5 basil leaves coarsely chopped
1 tablespoon sugar – optional. (See notes below)
1 pound penne - or any pasta
Grated Parmigiano for serving
Instructions
Bring a large pot of salted water to a boil.
In a large skillet over medium heat sauté the onion in the olive oil until it’s golden. Add the tomatoes salt and pepper. Add the basil and a little sugar as desired. Lower the heat and simmer until reduced 20 – 30 minutes.
Cook the pasta until al dente (about 2 minutes less than package directions). Drain add to the sauce and mix together over medium heat.
Serve immediately with grated Parmigiano.
Notes
The above measures are a guide but add or subtract to taste. Nanni used a food mill to purée canned tomatoes and remove the seeds - which are said to have a slightly bitter taste. I rarely use one and instead rely on a speedy blender. Sugar is a controversial addition. My grandmother preferred a slightly sweet sauce and so added it citing the fact that canned tomatoes are more bitter than fresh ones. I rarely add it. She would not add it to sauces with meat such as a ragú.