This recipe for pine bark bread comes from Sweden and uses the outer bark of a pine tree ground into a fine flour. The resulting bread is more like what most people would consider crackers.
Preheat oven to as hot as it goes, around 500 degrees for mine.
Mix all ingredients to form a dough. Adjust with more water or flour if it is either too sticky or dry.
Bake for about 3 minutes, turning the sheets halfway through. When the crackers come out of the oven they'll have a soft texture, but they'll be crisp once they cool.