01 - Boil pasta in salted water until al dente following package instructions. Reserve ½ cup pasta water, then drain pasta.
02 - Heat olive oil in a large skillet over medium heat. Add finely chopped onion and cook until soft and translucent, about 4-5 minutes.
03 - Stir in minced garlic and cook until fragrant, approximately 30 seconds.
04 - Incorporate crushed tomatoes, sugar, salt, and black pepper. Simmer gently for 8-10 minutes, stirring occasionally until sauce thickens slightly.
05 - Reduce heat and stir in heavy cream. Let sauce simmer gently for 2 minutes to blend flavors.
06 - Add grated Parmesan and stir until fully melted, producing a smooth sauce.
07 - Toss cooked pasta with sauce, gradually adding reserved pasta water to achieve desired consistency and coverage.
08 - Remove from heat, fold in fresh basil leaves, and mix thoroughly.
09 - Plate immediately, garnishing with extra Parmesan and basil as preferred.