Get a large pot of water to a heavy boil, and prep the onions and garlic: get a large pot and fill it ¾ of the way up with water. Add some salt to the pot, and put it over high heat to bring it to a boil. While the water is heating up dice the onion as small as you can, and crush the garlic, removing their skins. We are crushing the garlic for this recipe because we are looking for a very mild taste in the final product. If you want a more aggressive taste then feel free to mince the garlic instead.
Add the penne to your pasta pot: After you have prepped the onions and garlic, and the pot of water has come to a full boil, and I do mean a FULL BOIL, add the penne and let it cook for one minute less than the boxes instructions for al dente.
Sauté the onions: Quickly melt the butter and heat up the olive oil in a sauté pan. Add the onions and sauté them for 2 to three minutes on a medium high heat
Add the garlic and red pepper: After the onions have sautéed for a couple minutes add the crushed garlic and red pepper flakes. Let these three ingredients sauté in the butter and oil for another minute or two, stirring often.
Add the crushed tomatoes: Pour the whole can of crushed tomatoes into the sauté pan and quickly stir everything together. At this time I typically like to add about a half cup of the pasta water to the sauté pan, as the crushed tomatoes can often be too thick. Let the mixture come to a boil and then turn down the heat to medium low and let it all simmer. Stir often.
Add the vodka and cream: After the sauce has simmered for a couple minutes add the vodka and cream, mixing them both in thoroughly. Continue to let the sauce simmer until the penne is done per my instructions in step 2. You can now see that the sauce has taken on its distinctive pink color.
Drain the penne and add to the sauce: Once the penne is ready, drain it in a colander, don’t wash it as some of us a prone to do, and add it all to the sauce. We are now going to mix the penne into the sauce and let it finish cooking in it for about 3 minutes. Cooking the pasta in the sauce ensures that it becomes completely covered, and allows its flavors to permeate the penne, proving a richer flavor.
Add the basil and parmesan cheese: Turn off the heat, I repeat TURN OFF THE HEAT, and add the basil and parmesan cheese. We want the heat off because we want the cheese to melt into the sauce not cook into it. Simply stir in the ingredients for a minute, and the residual heat of the pan will melt the cheese so that it becomes a part of the sauce.