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1
Beat egg whites and granulated sugar at medium speed with an electric mixer about 3 minutes or until foamy; add 1/2 cup butter, beating until blended.
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2
Combine 2 1/2 cups flour, 1/2 teaspoon baking soda, and 1 teaspoon cream of tartar; add to butter mixture alternately with milk, beginning and ending with flour mixture. Beat at low speed just until blended after each addition. Set batter aside.
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3
Beat egg yolks and brown sugar at medium speed with electric mixer; add remaining 1/2 cup butter, beating until blended. Stir in 1/2 cup molasses.
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4
Combine remaining 2 1/2 cups flour, remaining 1/2 teaspoon baking soda, remaining 1 teaspoon cream of tartar, and spices; add to brown sugar mixture alternately with buttermilk, beginning and ending with flour mixture. Beat at low speed just until blended after each addition.
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5
Drop batters by spoonfuls, alternating dark and light next to each other, into 2 greased and floured 9- x 5-inch loafpans. Gently swirl light and dark batters together with a knife.
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6
Bake loaves at 350u00b0 for 45 to 50 minutes or until a wooden pick inserted in center comes out clean. Cool in pans on wire racks 10 minutes, and remove from pans.Cool loaves completely on wire racks.
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7
Drizzle Orange Glaze over warm loaves; cool completely.
