Place the 12-ounce box of half-cut spaghetti in a large deep pan and add 3 cups cold water; add a pinch of salt if desired.
Bring the water to a boil over high heat and cook the pasta, stirring occasionally, until the water is mostly absorbed and the pasta is al dente, about 10 minutes—watch closely to avoid overcooking.
Meanwhile, heat a large skillet over medium-high and add the ground beef; break it up with a spatula and cook until no pink remains.
Pour the 24-ounce jar of tomato and basil sauce into the cooked beef, stir to combine, and heat for 1–2 minutes until warmed through.
When the pasta is cooked and most of the water has been absorbed, add the sauce and beef mixture to the pasta (or spoon the sauce over plated pasta) and toss gently to combine.
Serve immediately and optionally garnish with finely chopped fresh basil and freshly grated Parmesan.