Puree salmon filet in a food processor. Put the salmon into a stainless bowl over ice to chill and firm it up. Add the egg white and whip the mixture up with spatula. While whipping, add heavy cream to a smooth consistency. Adjust salt and pepper, then add 1 teaspoon Pernod, 1 teaspoon cognac, and 1 tablespoon caviar. Mix well and put in piping tube. Reserve.