01 - Bring a large pot of generously salted water to a rolling boil. Add the pasta and cook according to package instructions until al dente. Drain through a colander, reserving 1/2 cup of the starchy cooking water for later use.
02 - While the pasta cooks, warm olive oil in a large skillet over medium heat. Add the minced garlic and chopped onion, sautéing until fragrant and translucent, about 3 to 4 minutes.
03 - Pour in the crushed tomatoes, sugar, dried oregano, red pepper flakes, salt, and pepper. Stir to combine and let the sauce simmer uncovered for 10 to 15 minutes, stirring occasionally, until it thickens and the flavors concentrate.
04 - Transfer the drained pasta into the skillet with the sauce. Toss thoroughly to coat every strand or piece, adding splashes of the reserved pasta water as needed to achieve a silky, cohesive consistency.
05 - Remove the skillet from heat. Fold in the torn fresh basil and grated Parmesan cheese until evenly distributed, then drizzle with olive oil for a glossy finish.
06 - Divide among warmed plates or bowls immediately. Offer additional Parmesan and fresh basil at the table for guests to garnish as desired.