Melt one half of the butter in a fry pan and heat it until it is very hot and almost smoking. Add the Cajun Magic, the Cayenne pepper and the Rosemary and cook the spices for a few minutes. Add the shrimp and cook until they change color. Add the beer and Worschtechire Sauce, reduce the heat and let it simmer until the liquid reduces to half. Melt in the rest of the butter and serve with rice.