Orange gives this citrus glaze a twist from traditional lemon.
Preheat oven to 350°. Grease and flour 2 (8 1/2 - x 4 1/2 -inch) loaf pans.
Beat butter at medium speed with an electric mixer until creamy; gradually add sugars, beating until fluffy. Add molasses; beat until blended. Add eggs, 1 at a time, beating until blended after each addition. Beat in buttermilk until blended.
Combine flour and next 5 ingredients in a large bowl. Gradually add to butter mixture, beating until blended. Pour batter into prepared pans.
Bake at 350° for 50 to 53 minutes or until a long wooden pick inserted in center comes out clean. Cool in pans on wire racks 10 minutes; remove from pans to wire racks, and cool completely (about 1 hour). Drizzle with Citrus Glaze. Garnish, if desired.