Caribbean christmas ring with orange sugar glaze

Ingredients

• 3 tablespoons shortening
• 2 1/2 cups walnuts, finely chopped
• 1 cup all-purpose flour
• 1/2 cup whole wheat flour
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• 3/4 cup butter, softened
• 1 1/3 cup granulated sugar
• 3 large eggs
• 1 cup sour cream or plain non-fat yogurt
• 1 ripe banana, mashed
• 2 tablespoons orange liqueur
• Orange Sugar Glaze
• 1 cup confectioner’s sugar, sifted
• 2 tablespoons orange juice