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Bring a large pot of generously salted water to a boil. Add the rigatoni and cook according to package directions until al dente. Reserve 1 cup of pasta water before draining the pasta.

While the pasta cooks, heat the olive oil in a large skillet or Dutch oven over medium heat. Add the chopped yellow onion and cook until softened and translucent, about 5-7 minutes.

Add the minced garlic and red pepper flakes (if using) to the skillet and cook for 1 minute more, until fragrant. Be careful not to burn the garlic.

Pour in the crushed tomatoes and the 1 tablespoon of kosher salt. Bring the sauce to a gentle simmer, then reduce the heat to low, cover, and let it cook for 10 minutes, allowing the flavors to meld.

Stir in the heavy cream and grated Parmesan cheese until well combined and the cheese has melted into the sauce.

Add the fresh spinach to the sauce in batches, if necessary, stirring until it wilts down completely. This should only take a couple of minutes.

Add the cooked and drained rigatoni to the skillet with the sauce. Toss to coat the pasta evenly. If the sauce is too thick, add a splash or two of the reserved pasta water until it reaches your desired consistency.

Season with freshly ground black pepper to taste. Serve immediately, garnished with additional grated Parmesan cheese if desired.

Bring a large pot of generously salted water to a boil. Add the rigatoni and cook according to package directions until al dente. Reserve 1 cup of pasta water before draining the pasta.

While the pasta cooks, heat the olive oil in a large skillet or Dutch oven over medium heat. Add the chopped yellow onion and cook until softened and translucent, about 5-7 minutes.

Add the minced garlic and red pepper flakes (if using) to the skillet and cook for 1 minute more, until fragrant. Be careful not to burn the garlic.

Pour in the crushed tomatoes and the 1 tablespoon of kosher salt. Bring the sauce to a gentle simmer, then reduce the heat to low, cover, and let it cook for 10 minutes, allowing the flavors to meld.

Stir in the heavy cream and grated Parmesan cheese until well combined and the cheese has melted into the sauce.

Add the fresh spinach to the sauce in batches, if necessary, stirring until it wilts down completely. This should only take a couple of minutes.

Add the cooked and drained rigatoni to the skillet with the sauce. Toss to coat the pasta evenly. If the sauce is too thick, add a splash or two of the reserved pasta water until it reaches your desired consistency.

Season with freshly ground black pepper to taste. Serve immediately, garnished with additional grated Parmesan cheese if desired.
