Boil Rigatoni until al dente, 9-11 minutes.
Trim & Half zuchinni. Heat a drizzle of oil in large pan on med-high heat, add zuchinni, season with salt and pepper. Cook 5-6 minutes transfer to plate. Cook sausage in same pan until cooked through. Stir in garlic and tomato paste with sausage. Cook 2 minutes. Stir in cream cheese, stock concentrate, 1/2 cup reserved pasta cooking water and 1 Tbs butter, 1/2 tsp sugar and a pinch of chili flakes. Remove from heat, add drained rigatoni, zuchinni and parmesan cheese. Season with salt and pepper. Divide between bowls, top with parmesan cheese.
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