01 - Bring a large pot of salted water to a boil. Cook the pasta according to package instructions until al dente. Reserve ½ cup of pasta cooking water, then drain the pasta.
02 - Heat olive oil in a large skillet over medium heat. Add the finely chopped onion and cook for 4 to 5 minutes until soft and translucent.
03 - Incorporate the minced garlic and cook for 30 seconds until fragrant, stirring constantly.
04 - Pour in the crushed tomatoes, then add sugar, salt, and black pepper. Simmer gently for 8 to 10 minutes, stirring occasionally, until the sauce thickens slightly.
05 - Reduce heat and stir in the heavy cream. Allow the sauce to simmer gently for 2 minutes to combine flavors.
06 - Stir in the grated Parmesan until melted, creating a smooth, velvety sauce.
07 - Add the cooked pasta to the sauce, tossing to coat evenly. Gradually add reserved pasta water, a little at a time, to achieve desired consistency.
08 - Remove from heat and fold in the fresh basil leaves gently.
09 - Plate immediately, garnished with additional Parmesan and basil as preferred.