Combine onions, peel, sugar, salt, cayenne, orange juice and brandy in a small bowl and set aside. In a 10 inch square casserole place tenderloins side by side. Tie with string at 1 1/2 inch intervals. Pour juice mixture over meat. Cover and microwave on medium high for 20 to 27 minutes or until meat is no longer pink and internal temperature registers 165 degrees Farenheit in several places. Turn pork over several times. Tenderloin can also be cooked in conventional oven. Remove pork from casserole. Wrap in foil. Set aside. In a mixing bowl blend flour and water until smooth. May need to add more flour. Cut orange slices into quarters. Add flour mixture and orange pieces to liquid in casserole. Microwave on high two to four minutes or until mixture thickens and bubbles stirring once. Slice pork and serve with rice. Spoon sauce over the top. Makes 6 servings.