Heat oven to 350°. Grease and flour 12-cup fluted tube cake pan. Beat baking mix, 1 cup sugar, the shortening, milk, orange peel, orange juice, eggs, 12 drops yellow food color and 8 drops red food color in large bowl with electric mixer on low speed 30 seconds, scraping bowl frequently. Beat on medium speed 4 minutes, scraping bowl occasionally. Pour batter into pan.