Dissolve yeast and sugar in 1/2 cup warm water. Allow to activate for 5 minutes. In a large mixing bowl, combine milk, 1/4 cup water, shortening, honey, salt and wheat flour. Stir to combine. Mix in yeast mixture and stir to combine. Let rest 15 minutes. Add bread flour, and mix until dough forms a ball. Turn out onto lightly floured surface and knead dough for 10 minutes, or until smooth and elastic. Place the dough in a buttered bowl, and turn to coat. Cover the bowl with plastic wrap and place in a warm, draft-free space. Let dough rise for 45 minutes, or until almost doubled.
Punch down, and knead dough on lightly floured surface 3 to 4 minutes. Form into loaves, and place in buttered 9x5 inch bread pans. Butter the tops of the dough and let rise in a warm area until doubled, about 30 minutes.
Preheat oven to 375 F. Bake for 25 to 35 minutes, or until tops are dark golden brown. Cool completely before slicing.