Vodka sauce is an Italian sauce made from a relatively smooth tomato sauce, plus cream, vodka, and typical Italian herbs. It gained popularity in the 1970s, when a variation won a national recipe contest in Italy. It is a key ingredient in penne alla vodka, although it may well have been a sauce before its "invention" in the 1970s. I suspect it's popularity is more a North American thing since vodka isn't exactly Italian . . . The vodkas function is, ostensibly, to release flavors in the tomato that are normally inaccessible; using alcoholic beverages for this purpose is common in Italian cooking, although this is usually accomplished with wine.
I've seen this on all sorts of menus but never ordered it. This week Paul decided it was time to cook a recipe from the folks at Fine Cooking that I had printed off more than a year ago - the dehoarding continues. :-) The recipe comes together quickly and Paul was happy with the process; he barely worked up his 'I'm cooking dinner sweat'.
I was happy with the results - delicious! We found the spiciness to be spot on and loved the freshness that the parsley added. It was a great base recipe - I can imagine all sorts of uses for this sauce in the future.
There are some who might find it a bit on the spicy side - if you're cooking for the elderly, children, or those who think they must eat like one of the aforementioned you may want to decrease the amount of pepper flakes.

Rigatoni with Spicy Tomato-Vodka Sauce
2 cloves garlic, minced
3/4 tsp. crushed red pepper flakes; more to taste
2 Tbs. extra-virgin olive oil
1 28-oz. can diced tomatoes
3 Tbs. vodka
1/2 cup freshly grated Parmigiano Reggiano
1/4 cup chopped fresh flat-leaf parsley
3 Tbs. cream
1/2 tsp. kosher salt
1/2 tsp. freshly ground black pepper
3/4 lb. rigatoni (about 4 cups)
Bring a large pot of well-salted water to a boil.
Meanwhile, in a large saucepan over medium-high heat, heat the garlic and red pepper flakes in the oil until they’re fragrant and sizzle steadily for about 30 seconds. Add the tomatoes and their juices and the vodka, and bring to a boil. Then reduce the heat to a steady simmer, cover with the lid slightly ajar, and cook to intensify the flavors and reduce the sauce slightly (by about one-quarter), 10 to 15 min.
Purée the tomatoes using a hand blender or a regular blender. If you used a regular blender to purée, return the sauce to the saucepan. Stir in 1/4 cup of the Parmigiano, the parsley, cream, salt and pepper, and more red pepper flakes if you like. Simmer to incorporate the cream and reduce the sauce slightly, about 5 min. Reduce the heat to low, cover, and keep warm.
Meanwhile, cook the pasta, stirring occasionally, until it’s just tender to the tooth, 10 to 12 min. Drain well and return the pasta to its pot. Add the sauce, set the pot over medium heat, and cook, stirring, to let the pasta absorb some of the sauce, 1 min. Serve immediately with a sprinkled with the remaining 1/4 cup Parmigiano.