Soak vodka and pepper flakes for 10 minutes - the longer the pepper flakes soak, the hotter the sauce will be. Remove flakes; vodka will turn red.
Saute olive oil and onion in a pot until the onions have softened.
Add in the tomatoes and vodka and cook on low for 1/2 hour, stirring every 5 minutes or so. Then add parmesan cheese and half -and-half. Cook another 20 minutes.
Serve over pasta of your choice. You can add ground beef to this sauce if desired.
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