Do I have to use vodka?
No, but it can help. A splash of vodka often makes tomato sauces taste a little more rounded and aromatic. If you skip it, replace with a little pasta water or chicken broth and keep going. Still delicious, just less classic vodka-sauce vibe.
What can I use instead of Calabrian chile paste?
Use 1 to 2 teaspoons red pepper flakes, or a spoonful of your favorite hot sauce stirred in at the end. Calabrian chile paste has a fruity heat, so if you have it, it is worth grabbing.
How spicy is Calabrian chile paste?
It varies a lot by brand. Start with 1 tablespoon, simmer, then taste and decide if you want to go bigger. You can always add more, but you cannot un-spice the pan.
Why did my sauce look greasy or split?
Usually the heat was too high when the cream went in, or it cooked too long after adding cheese. Turn the heat down and fix it with a splash of pasta water, stirring steadily until it emulsifies again. Also, finely grated Parmesan melts smoother than pre-shredded.
Can I make it vegetarian?
Absolutely. Skip pancetta and start with 2 tablespoons olive oil. Add sautéed mushrooms or blistered cherry tomatoes for extra savory depth.
What pasta shape works best?
Rigatoni is the MVP because it grabs sauce inside the tubes. Penne, mezze rigatoni, or even shells work great too.