Put 1 teaspoon sweetener and yeast in 1/2 cup warm water to let it dissolve.
Boil peeled potato in 2 cup water.Add 1 teaspoon salt.
Mash the potato in a medium bowl, reserve the water.
Combine the mashed potato, potato water, 1 tablespoon salt, 1/3 cup of sweetener, oil and milk in a large bowl.
Mix yeast when only the milk mixture is warm.
Mix 15 cup of whole-wheat flour and stir it with a help of a spoon.
Place dough out on a surface slightly floured.
Knead it for ten minutes.
Place it in a lubricated bowl and turn to coat surface.
With a cloth cover it and allow it to rise till it is doubled, it will take about 1 1/2 hours.
Reduce or punch down it and knead it again for 3 minutes.
Place it back in a bowl and again allow it to rise till it is doubled, it will take about 1 hour.
Reduce it or punch down it and make 4 loaves.
Place it into lubricated bread pans.
Again allow dough to rise for 30 – 60 minutes.
For about 1 hour bake it in a preheated oven at 325 degrees F