Boil a large pot of salted water and cook the rigatoni according to package instructions until al dente. Reserve 1/4 cup of the cooking water before draining the pasta.
In a large skillet, heat about 5 tablespoons of the reserved oil from the sun-dried tomatoes over medium heat. Add minced garlic and chopped shallot, sautéing for about 3 minutes until soft and fragrant.
Add the diced eggplant to the skillet and sauté for another 3 minutes until starting to soften.
Stir in the sun-dried tomatoes, cooking for about 5 minutes to meld the flavors.
Incorporate the puréed tomatoes, bringing the mixture to a gentle boil. Reduce heat and let it simmer for about 5 minutes. Season with crushed red pepper flakes, smoked paprika, salt, and black pepper to taste.
Stir in the ricotta cheese until well blended. Add the cooked rigatoni, tossing to combine. If the mixture is too thick, add a splash of reserved pasta water to loosen it.
Let everything heat through for about 1 more minute, then serve warm, garnished with fresh herbs if desired.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3-4 days. Reheat gently on the stovetop.