Bring a large pot of salted water to boil for the pasta. Cook penne according to package directions until al dente, about 11-13 minutes. Reserve 1 cup of pasta cooking water before draining.

While pasta cooks, dice the pancetta into small cubes. Heat a large sauté pan over medium heat and add pancetta. Cook for 6-8 minutes until crispy and golden, stirring occasionally. Remove pancetta with a slotted spoon and set aside, leaving the rendered fat in the pan.

Add olive oil to the pancetta fat. Sauté diced onions for 4-5 minutes until softened and translucent. Add minced garlic and cook for 1 minute until fragrant, stirring constantly to prevent burning.

Add tomato paste and cook for 2 minutes, stirring to coat the aromatics. This concentrates the tomato flavor. Pour in the vodka carefully and let it simmer for 3-4 minutes to cook off the alcohol.

Stir in tomato sauce, salt, black pepper, and red pepper flakes. Simmer the sauce for 8-10 minutes, stirring occasionally, until it thickens slightly and the flavors meld together.

Reduce heat to low and slowly stir in the heavy cream, mixing until fully incorporated and the sauce turns a creamy pink color. Add half of the cooked pancetta back into the sauce.

Add the drained penne to the sauce and toss to coat evenly. If the sauce is too thick, add reserved pasta water a little at a time until you reach desired consistency.

Remove from heat and stir in half the Parmesan cheese and torn fresh basil leaves. Taste and adjust seasoning with additional salt and pepper if needed.

Serve immediately in warmed bowls, topped with remaining crispy pancetta, extra Parmesan cheese, and fresh basil leaves.