Rub the cold grill rack with oil, and light coals or start grill. Brush bananas with vegetable oil and grill for 2 to 3 minutes. Remove from the grill, peel, and cut into medium-size pieces. In a medium-size saute pan, heat butter until bubbling. Add brown sugar and bring to a boil. Add banana pieces and rum. Splash with Grand Marnier. Boil for about 1 minute. Add cinnamon and ginger; remove from heat. Serve warm over ice cream, garnished with orange zest. Serves four. Per serving: 416 Calories (kcal); 16g Total Fat; (48% calories from fat); trace Protein; 38g Carbohydrate; 31mg Cholesterol; 17mg Sodium Food Exchanges: 0 Grain(Starch); 0 Lean Meat; 0 Vegetable; 0 Fruit; 3 Fat; 2 1/2 Other Carbohydrates Converted by MM_Buster v2.0n.