Bring a large pot of water to a rolling boil and salt it generously.
While the water heats, prepare the sauce.
In a large serving bowl, combine the chopped tomatoes, olive oil, smashed garlic, and half of the minced basil.
Sprinkle with salt and pepper.
Using a fork or a potato masher, gently crush the together until the tomatoes release their juices but the sauce remains chunky.
Do not puree.
Cook the pasta in the boiling water until al dente (tender but not mushy). Just before draining, ladle about a 1/4 cup (960 ml) of the hot pasta water into the tomato sauce to warm it slightly.
Remove and discard the smashed garlic cloves from the sauce.
Drain the pasta well and immediately add it to the bowl with the sauce.
Toss thoroughly to combine.
Top with the remaining fresh basil and serve immediately. Pass the grated Parmesan at the table, if using.