In a large, deep skillet, melt the butter over moderate heat, Gently sauté the onions until it becomes very soft and transparent (about 10 minutes).
Turn up the heat and add the vodka allow the alcohol to burn off for a minute after that dice the smoked salmon.Add the smoked salmon in the skillet cook for 2 minutes. Reduce heat and add the sour cream, stirring occasionally ( for about 4 minutes ).Remove the skillet from the heat and add the caviar.In a large pot of water to a boil add a pinch of salt. Cook the farfalle in the boiling water until al dente; (about 8 to10 minutes).Drain the pasta and add it to the sauce. Stir so that the sauce coats all the pasta. Sprinkle generously with the chopped parsley.