Preheat oven 400°F.
Place a large pot of water over high heat and bring up to boil to cook the ziti. Once boiling, add some salt and the pasta, and cook just shy of al dente. Drain thoroughly.
While the water is coming up to a boil, start the red sauce: Place a medium-size saucepot over medium-high heat with 2 turns of the pan of EVOO, about 2 tablespoons. Add the onion and garlic, and cook, stirring every now and then until the onions start to get tender, about 3-4 minutes.
Add the tomatoes and smash them up into small pieces with a potato masher or with the back of a spoon. Add the basil and season with some salt and pepper. Bring up to a bubble and simmer for 15 minutes.