Combine 1/2 cup all-purpose flour, whole wheat flour, undissolved yeast, orange peel and salt in a large mixer bowl. Heat milk, water, honey and butter until very warm (120° to 130°F). Gradually add to flour mixture. Beat 2 minutes at medium speed of electric mixer, scraping bowl occasionally. Stir in nuts and enough remaining flour to make a soft dough. Knead on lightly floured surface until smooth and elastic, about 8 to 10 minutes. Cover; let rest 10 minutes.
Divide dough into 3 equal pieces; form each into smooth ball. Place in greased 8-1/2 x 4-1/2-inch loaf pan. Cover; let rise in warm, draft-free place until doubled in size, about 1 hour.
Bake at 375°F for 30 to 35 minutes or until done. Cover with foil during last 10 minutes to prevent excess browning. Remove from pan; cool on wire rack.