Penne with Vodka & Tomato Cream Sauce

I got this recipe YEARS ago from a vineyard in the Santa Ynez Valley in California. Each time I make it, hubby says "It's restaurant quality." Quick, easy, and very yummy.

1 Tbs. butter
1 Tbs. Olive Oil
1 small onion (or 1/2 medium)--chopped
1 140z can diced tomatoes
1/2 cup heavy cream
1/2 cup Vodka
1/4 tsp crushed red pepper flakes
1/2 lb. penne pasta (cooked and drained)
Fresh grated parmasean cheese

Heat pan, combine butter and Olive Oil. Add onion and saute until translucent. Add can of tomatoes and simmer for 3 minutes. Add cream, Vodka, and pepper flakes. Simmer for additional 3-4 minutes for flavors to blend. Add pasta and toss. Top with Parm. cheese.