In a large pot with a lid, heat up the extra-virgin olive oil and add the red onion and chili pepper, and let cook together until soft. Add the totani, and let cook for about a minute on medium heat, stirring continuously to avoid sticking.
Squeeze the cherry tomatoes with your fingers to remove the seeds and add to the pot. (To avoid a mess of seeds and juices, squeeze the cherry tomatoes submerged in a bowl of water.) Season with salt. Lower the heat, cover the pot, and cook for 2 to 3 minutes.
Meanwhile, cook the tubetti pasta in boiling salted water until al dent, about 8 minutes. Drain the pasta, saving some of the pasta water. Add the pasta to the large pot along with a little pasta water, and cook for a few more seconds allowing all the flavors to come together.
Lastly, add the parsley and finely chopped garlic to maximize the intensity of the flavors. Stir well and serve immediately.
Totani can be substituted with squid.