Dissolve
yeast and 1 teapoon sugar in 1/2 cup warm water.
Boil
one medium peeled potato in 2 cups water with 1 teaspoon salt. Mash the
potato in a medium bowl, while reserving the water. Combine the mashed
potato, potato water, 1/3 cup of sugar, shortening or oil, 1 tablespoon
salt, and milk in a large bowl.
Make
sure the milk mixture is warm, and add the yeast. Stir in 15 cups of whole
wheat flour.
Turn dough
out onto a lightly floured surface. Knead for about 10 minutes. Place in greased bowl, and turn to coat
the surface. Cover with a damp cloth, and allow to rise
until doubled. Rising time will be about 1 1/2 hours. Punch down, and
knead again for 3 minutes. Place back in bowl, and allow to rise again until doubled. The second rising period
should be about 1 hour. Punch down. Form 4 loaves, and place into 9 x 5
inch greased bread pans. Let dough rise again for 30 - 60 minutes.