In mixing bowl, CREAM brown sugar and butter.
ADD eggs, orange peel, and vanilla; BEAT until fluffy.
In a separate bowl, MIX flour, baking powder, soda and salt; ADD in portions to creamed mixture, ALTERNATING with buttermilk; BEAT after each addition.
DROP tablespoonsful onto ungreased baking sheet; BAKE at 350F for ten minutes.
COMBINE orange peel, orange juice, and butter; STIR in powdered sugar.
SPREAD over cooled cookies.
Per Serving (excluding unknown items): 776 Calories; 29g Fat (33.5% calories from fat); 8g Protein; 123g Carbohydrate; 1g Dietary Fiber; 128mg Cholesterol; 750mg Sodium. Exchanges: 2 1/2 Grain(Starch); 0 Lean Meat; 0 Fruit; 0 Non-Fat Milk; 5 1/2 Fat; 5 1/2 Other Carbohydrates.