Heat a large pan over medium heat. Add olive oil, nduja, salt, and black pepper. Sauté for 5 minutes.
Add garlic to the pan. Sauté for 2 minutes.
Add tomato paste to the pan. Mix well, then add heavy cream. Stir and reduce heat to low. Simmer while you cook the pasta.
Heat a large pot of salted boiling water over medium heat. Once the water is boiling, cook rigatoni until al dente, about 7-8 minutes. Use a large spider strainer to transfer the pasta directly into the sauce. This will incorporate the perfect amount of pasta water. Alternatively, you can save ¼ cup pasta water, drain the pasta, and add to the sauce.
Toss pasta in the sauce until well combined. Add butter and toss until combined. Top with parmesan cheese and serve.
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