In a small bowl, cream the butter, almond paste and 1/2 teaspoon orange zest until light and fluffy. In a microwave, melt white baking chocolate; stir until smooth. Gradually add to creamed mixture. Slowly stir in orange juice. Beat until smooth. Cover and refrigerate for 20 minutes or until easy to handle, stirring occasionally.
Shape into 2-in. logs; place on waxed paper-lined baking sheets. Loosely cover and refrigerate for 30 minutes or until firm. Combine coarse sugar and remaining orange zest; set aside.
In a microwave, melt chocolate chips and shortening; stir until smooth. Dip logs in chocolate, allowing excess to drip off. Place on waxed paper-lined baking sheets. Sprinkle with sugar mixture. Let stand until firm.