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Export 8 ingredients for grocery delivery
Step 1
Bring a large pot of lightly salted water to a boil. Place a large sauté pan over medium-low heat, and add onion, oil and a sprinkling of salt. Sauté onion until soft and beginning to caramelize, about 10 minutes.
Step 2
Add tomatoes and their juices, and simmer for 15 to 20 minutes. Add heavy cream, and remove from heat.
Step 3
Add pasta to boiling water and cook until al dente. Drain pasta and return to cooking pot. Add vodka, butter and salt to taste. Gently mix penne until butter is melted. Add tomato mixture, and mix until pasta is coated.
Step 4
To serve, transfer pasta and sauce to a large warmed bowl. Pass Parmesan cheese for guests to serve themselves.