Carrot Ribbon Cake

Name: Carrot Ribbon Cake
Ingredients: 2 1/2 c. all-purpose flour; 2 tsp. ground ginger; 2 tsp. ground cinnamon; 2 tsp. baking soda; 1 tsp. baking powder; 1 tsp. salt; 4 large eggs; 1 c. granulated sugar; 1/2 c. packed brown sugar; 3/4 c. vegetable oil; 1/4 c. orange juice; 1 can crushed pineapple in juice; 1 lb. carrots; 1 c. walnuts; 12 oz. cream cheese; 4 tbsp. butter or margarine; 1 1/2 c. confectioners' sugar; 1 pinch salt; 2 large carrots; 1/4 c. granulated sugar; 1/2 c. water; Fresh mint sprigs