Cook the pasta

• Bring a large pot of salted water to a boil.
• Cook the pasta until al dente, then drain, keeping a little cooking water.

Make the sauce base

• Heat the olive oil in a large pan and soften the onion.
• Add the garlic and chili flakes and cook until fragrant.
• Stir in the tomato paste and cook it down until darkened.

Add the vodka

• Pour in the vodka and stir, letting the alcohol cook off.

Finish the sauce

• Lower the heat and stir in the cream and butter.
• Add the grated parmesan and season with salt and pepper.

Combine and serve

• Toss the drained pasta into the sauce, loosening with a splash of cooking water.
• Serve topped with basil leaves and extra parmesan.