In a skillet large enough to hold the shrimp without crowding, heat butter.
When hot, add the shrimp and sauté for 1 to 2 minutes.
Turn shrimp on the other side, add the tomatoes, shallots and sweat them for 1 minute, making sure not to burn them.
Add the vermouth and Sambuca and let reduce by half.
Add the cream, reduce for a couple minutes, add salt and pepper to taste.
Add butter OFF the heat and cook serve immediately.
