Cook the pasta according to directions. Before the water starts to boil, add about a tablespoon of salt and olive oil into the water. Stir the pasta to prevent sticking and drain when ready.
Using a food processor, finely chop the onion, garlic cloves, and Trader Joe's Fire Roasted Red Peppers (recommended approach). In a large sauté pan over medium heat, add olive oil. Add the chopped onion, garlic, and red pepper to the pan. Season with salt and pepper to taste. Cook for 3-4 minutes until just softened. Add the shrimp and sauté in the pan for 5-6 minutes. Once the shrimp is slightly cooked, add the pumpkin puree, heavy cream, hot sauce and red chili flakes. Stir to combine. Bring the sauce to a boil. Once the sauce starts to boil, lower to medium-low heat and simmer covered for 5-7 minutes. See note below.
Add the chopped parsley and shredded parmesan cheese to taste. Stir until the parmesan cheese melts. Season with additional red chili flakes if needed. When serving, spoon the shrimp pumpkin sauce on top of the cooked rigatoni. Top with additional parmesan cheese and chopped parsley. Enjoy!