Penne pasta with tomato sauce

PREPARATION:

1. Heat a large pan over medium heat. Add olive oil and finely chopped onion. Cook for 8-10 minutes until the onion is clear stirring occasionally. 
2. Add flakes of chili pepper and garlic, cook for 2-3 minutes and stir until the smell appears. Add finely chopped tomatoes, stir and stew without lid for 20 minutes. 
3. Cook the paste al dente, stirring periodically, for 11 minutes in boiling salted water in a large saucepan. Before draining all the water, pour about 100 ml of water into a glass. The high content of starch in this water will then make the sauce thicker and silky. 
4. Add the cooked pasta to the sauce. Stir well, add a little water from the paste, if there is a need to dilute the sauce. Season with salt to taste. Buon appetito!