Cook the pasta according to package directions.
Saute the garlic and onions in 2 tablespoons butter and the olive oil in a saucepan over medium heat until soft. Pour in the vodka, being careful if your stove has an open flame (remove the pan from the heat before adding). Cook and reduce for 2 to 3 minutes, then pour in the tomato puree. Stir the mixture until it's thoroughly combined, then reduce the heat to low. Pour in the heavy cream. Stir to combine, then turn heat to the lowest simmer possible. Sprinkle in the red pepper flakes and add salt and pepper to taste. Finally, stir in the remaining 1 tablespoon butter. Pour the drained pasta into the sauce and toss to combine. Sprinkle on the Parmesan, then sprinkle on more red pepper flakes if desired.
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