Combine the yeast, sugar and warm water in a bowl and stir to dissolve the sugar.
Add a tablespoon of the bread flour to the warm water mixture and stir
Let the yeast/water mixture sit for 10 minutes to activate and proof the yeast.
Add the remaining bread flour and pine bark flour to the bowl and turn and mix with your hands or knead in a mix-master with a dough hook or in a bread machine on the dough cycle.
Lightly oil a metal bread pan.
Roughly shape the dough into a loaf shape and drop into the bread pan.
Cover the dough in the bread pan with a warm, damp dish towel and let rise for 1 hour
Preheat the oven to 350 degrees F.
Bake for 25 minutes.
Remove from the oven and let rest in the pan on the stove top for 15 minutes.
Remove from the bread pan, slice and serve.