Step 1 – Cook the Pasta:

Bring a large pot of salted water to a boil. Cook rigatoni until al dente. Reserve about 1 cup of pasta water before draining.

Step 2 – Brown the Sausage:

In a large skillet, heat olive oil over medium heat. Add sausage, breaking it apart, and cook until browned and crisp on edges.

Step 3 – Add Aromatics:

Add chopped onion and garlic to the sausage. Sauté until soft and golden, about 3–4 minutes.

Step 4 – Build the Sauce:

Stir in tomato paste and cook 1 minute. Pour in heavy cream and a splash of reserved pasta water. Stir until sauce thickens slightly. Add Parmesan cheese and let it melt.

Step 5 – Combine Pasta and Sauce:

Add cooked rigatoni to the skillet and toss until fully coated. Adjust consistency with more pasta water if needed. Add spinach if using, and stir until wilted.

Step 6 – Serve:

Serve hot, garnished with extra Parmesan, fresh parsley, and a sprinkle of black pepper or red pepper flakes. Pair with garlic bread or a green salad for a complete meal.