Add butter to a 12-inch cast iron skillet over medium heat. Stir occasionally until melted.
Add the remaining ingredients except shrimp. Stir and bring to a medium boil.
Add shrimp and return to a boil. Cook about 5 minutes or until shrimp turns pink.
Remove from heat and let shrimp soak in the broth for an additional five minutes for extra flavor. Taste broth and add more salt if necessary.
Serve with lots of crusty bread to dip in the broth.