In a large saucepan, combine the olive oil and garlic over medium-low heat. Cook, stirring occasionally, until the garlic is fragrant, about 30 seconds.
Add the rosemary and a pinch of red pepper flakes and cook until toasted and fragrant, about 1 minute more.
Stir in the tomato paste, then add 5 cups of water. Turn heat to high heat and bring to a boil.
Add the pasta and season generously with salt. Cook, stirring often, until the pasta is cooked.
Stir in the Parmesan. Taste and add more salt and pepper as needed.
Garnish with chopped fresh basil and shaved parmesan, Enjoy!
