Preheat the oven to 350°F.
Mix all of the dry ingredients together in a large bowl.
Boil the water.
Add the vinegar, malt flavor, rye flavor, molasses (if using) and the egg whites to the dry ingredients, and mix well. While mixing dough with a hand mixer, add the boiling water (should take about 30 seconds). Do not over mix the dough, the consistency will be similar to Play-Doh.
Moisten hands with a little avocado oil or water and transfer dough to a 9x5 loaf pan (greased if metal, uncreased if silicon).
Bake on in the oven for 1-1 1/2 hours. It should sound hollow when you tap on the bottom of the bread.
Allow the bread to cool completely (they will continue cooking a bit).