Preheat oven to 350°F.
Add the buckwheat flour, baking soda and baking powder to a mixing bowl and stir well.
Add the seeds, dried fruit and poppy seeds and stir.
Blend the date paste, apple cider vinegar and 1 cup of the soy milk in a blender until smooth.
Add to the flour mixture along with the remaining cup of soy milk and stir well.
Pour equal parts into two silicone or parchment lined bread pans.
Smooth top.
Bake for 40 minutes.
Let cool for at least 10 minutes and then place into the freezer for 3-4 hours.
Slice loaves into very thin slices with a very sharp knife.
Place slices on a parchment lined baking tray and bake for 15 minutes at 300°F (148°C).
Flip slices and bake for 15 more minutes.
If not quite dry and crisp yet, flip one more time and bake another 10-15 minutes.
Once cooled, store in an airtight container for up to 2 weeks.