In a deep pot or large pan heat the butter over medium-low heat.
Once butter is melted add the shallots and a heavy pinch of salt and cook for 8-10 minutes until shallots have sweated out and are translucent. * there should be no color on them, if they begin to brown turn down the heat.
Add in the garlic and cook for an additional 1-2 minutes.
Add tomato paste and Calabrian chilis and combine with onions and garlic. Cook for an additional 2-3 minutes, mixing every so often. Pour in the vodka and simmer for approx. 4 minutes on low.
Toss in the crushed tomatoes and simmer for 5 minutes with the lid on.
Slowly add in heavy cream and stir to combine. Simmer (not boil) for 3 minutes. Turn off the heat, add the cheese and mix until well incorporated.
Add in pasta and serve.
Notes
Want it really spicy add 3 tbsp of the Calabrian pepper paste!