1 pk Yeast
1 tb White sugar
12 c Bread flour
12 c Medium rye flour
2 c Whole wheat flour
1/2 c Unprocessed bran flakes
1 tb Caraway seeds
1 ts Salt
1 ts Instant coffee powder
1/4 ts Fennel seeds
1 c Water
2 tb Water
2 tb Molasses
2 tb Cider vinegar
1/2 oz Unsweetened chocolate
(I would cut back on that a bit) Cool the mixture to 105-115 degrees and add to dry ingredients. I suspect the exact ingredients don’t really matter all that much. As long as the flour-to-liquid proportions are such as to make a dough of good consistency, the result will probably be highly edible.