Step 1

Cook pasta to al dente according to package instructions. Reserve 1 cup of the cooking liquid before draining (you may not need all of this, but I always reserve 1 cup).

Step 2

While pasta is cooking, over medium heat, add olive oil to a large pan. When oil is hot, add onion. Cook for 2-3 minutes, then add garlic and cook 1 minute more. Stir often so garlic doesn't burn.

Step 3

Add tomato paste and cook for 2-3 minutes, stirring often. Tomato paste will turn a slightly darker color.

Step 4

Add vodka (if using) and cook for 1 minute. To make this dish without vodka simply omit this step OR use one of the substitutions listed in Note 1.

Step 5

Add heavy cream and red pepper flakes. Cook for 1-2 minutes, stirring often until sauce thickens (it will thicken up quickly!).

Step 6

Add in your pasta, 1/2 cup of pasta water and butter. Stir, stir, stir until butter is "melted and saucy" according to Gigi! :) Make sure the pasta is completely coated in the sauce. Add a little more pasta water if sauce seems too thick.

Step 7

Stir in Parmesan cheese. Taste and season with salt and pepper if needed. Sprinkle with basil and serve immediately.