Prawn thermidor Main DishVery Easy30 min Send this recipe to a friend Print this page Ask a question to the author Post your photo of this recipe Ingredients 4 4 pieces black tiger prawns, large, butterflied 1/4 cup butter 1/4 cup onion, minced 1/4 cup button mushrooms, sliced 1 tablespoon parsley, chopped salt and pepper, to taste SAUCE 2 tablespoons butter 2 tablespoons all-purpose flour 1/2 cup Evaporated nilk 2 tablespoons liquid cream A pinch of nutmeg salt and pepper 1/4 cup bread crumbs 2 tablespoons parmesan cheese, freshly grated View the directions