In a large pot or dutch oven, melt butter. Add trinity, cook until tender and liquid has cooked out. Add crawfish, seasoning blend and heavy cream. Reduce. In a skillet, melt 1/2 stick butter. Add 1/4 cup flour, stirring constantly to make roux. Stir until it reaches a nutty brown color. Remove from heat and gradually add to crawfish until mixture thickens. Spoon into pie crust and bake 5 to 10 minutes at 350 degrees. Note: Use a favorite recipe or store bought pie c rusts. Tart sized pastries can be used for individual servings. Posted to MM-Recipes Digest V4 #281 by Jim Kirk on Oct 26, 1997