Pasta Pomodoro is a quick and easy pasta dish that will quickly become a family favorite. This quick pasta sauce is full of tomato flavor. It's simple, tasty, and total comfort food.
Place tomatoes into a blender or food processor and puree until smooth. Set aside.
Heat olive oil in a large skillet over medium-high heat. Add in onion and saute 5 to 7 minutes until soft. Add in garlic and red pepper flakes and saute 1 minute more.
Pour in tomato puree, season with salt, and bring to a simmer. Simmer 10 minutes.
Meanwhile, cook pasta in boiling salted water according to package directions, drain.
Add pasta to sauce and toss to coat. Add in butter and parmesan and toss until butter is melted.