Cook the pasta: Bring a large pot of salted water to a boil and cook penne until al dente. Reserve 1/4 cup of the pasta water, then drain and set aside.
Sauté aromatics: In a large skillet over medium heat, warm olive oil. Add shallots and cook for 2–3 minutes until soft. Stir in garlic and red pepper flakes, cooking until fragrant.
Add tomato paste and vodka: Stir in tomato paste and cook for 2–3 minutes, until it darkens. Carefully pour in vodka and stir, letting it simmer until reduced by half (about 2 minutes).
Make it creamy: Lower the heat and stir in heavy cream. Let it simmer for another 2–3 minutes.
Finish the sauce: Add Parmesan cheese, stirring until melted and the sauce is smooth. Season with salt and black pepper.
Toss pasta: Add the cooked penne and toss to coat, using pasta water as needed to loosen the sauce.
Serve: Garnish with chopped herbs and more Parmesan. Serve immediately.