After an hour, put a pot of water on to boil for your pasta. Once it boils, throw in your penne.
Now, set a sauté pan with your oil and butter over medium to medium high heat. When the pan is hot, lay in your slices of tomato, trying to be sure to have them laying flat in the pan. Give the pan a shake to make sure they aren't sticking. After about 3 minutes, when the tomatoes are getting soft, using a fork or tongs, flip over each of the slices. After a minute, pour in your lemon juice, and the remaining vodka marinade. Turn the heat up to high, bring to a hard simmer, so as to let the liquid reduce. Turn the heat down to medium, and continue to simmer for 5 minutes or so.
By this point, your pasta should be pretty close to being done. Pour it into a colander, give that a shake a few times to make sure you get all the water out of the insides of the penne, and get ready to eat.
To plate up, put some of your pasta in the center of each plate. Then, using a fork or tongs, place slices of the tomato over the pasta. With a spoon, stir the remaining liquid in the pan, and spoon a few tablespoons of the liquid over the tomaotes and pasta. To be extra fancy, take a final tablespoon's worth and drizzle it around the rim of the plate.
With a vegetable peeler, shave some curls of parmesean cheese over the top of your pasta/tomatoes, and around the rim of the plate. A final cracking of black pepper, and you're set!