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1. Boil pasta in salted water.
2. Heat olive oil, add onions and garlic.
3. Add tomato paste and cook for 1 minute.
4. Pour vodka into pan.
5. Pour heavy cream into pan and mix with tomato paste.
6. Season with salt and chilli flakes. Add cooked pasta.
7. Stir shell pasta with vodka sauce.
8. Add grated parmesan.
9. Add butter and stir.
Add chopped basil and serve!
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