Cook pasta al dente according to package directions. Preserve 1 cup pasta water
Mince the garlic and chop the parsley.
In a non-stick skillet, heat up the olive oil on medium heat. Add in the the garlic, chili flakes and black pepper and cook for about a minute, tossing them around with a wooden spoon. Do not let them burn.
Add in the tomato paste and sauté with the garlic for another 2-3 minutes to cook the tomato paste very well.
Once that's done add in the tomato sauce, salt and mix well. Cover and let the sauce simmer on medium-low heat for 5 minutes
The pasta should be cooked now. Drain and pour them directly into the tomato sauce. Mix and cook for a couple more minutes then add in the parsley. Cook again for 2-3 more minutes. If you want your sauce less thick, add in the pasta water when you add the parsley.
Once the pasta is done cooking, remove and garnish with shaved parmesan and fresh herbs like parsley or basil.