Penne with Vodka Cream Sauce

This is a pasta dish that is so easy to make ... you can have this on the table in less than 30 minutes and it's really great!

1/2 stick (4 tablespoons) unsalted butter
1 medium onion, finely chopped
2/3 cup vodka
3/4 cup canned crushed tomatoes
1 cup heavy cream
A couple splashes of hot pepper sauce (like Tabasco), to taste
1/4 teaspoon salt
1/4 teaspoon finely ground black pepper
4 medium-sized fresh basil leaves, thinly sliced
1 pound penne
3/4 cup grated Parmigiano-Reggiano

Melt butter in a deep 12-inch heavy skillet over moderately low heat. Add onion and cook, stirring occasionally, until it begins to soften, about 5 minutes. Stir in vodka, bring to a simmer, and simmer for 4 minutes. Add tomato puree and cream and simmer, stirring occasionally, until onion is soft, about 5 minutes. Stir in Tabasco, salt, and pepper. Keep sauce warm over very low heat.

Cook pasta as directed on package until al dente. Reserve 1/2 cup cooking water and drain pasta.

Add pasta to sauce and toss with sauce and cheese. You can add some of the reserved cooking water if pasta seems dry.