Cranberry Orange Bread

Whoever created this recipe is a genius.  I found this recipe on-line somewhere.  This is a fabulous, very moist bread and I make it every Christmas to give to friends and neighbors.

Recipe:

Biga
50 g bread flour
50 g whole wheat flour
0.5 g instant yeast (1/8 tsp for me)
70 g water

Mix ingredients, cover and ferment at room temperature about 3 hours, then refrigerate overnight. You can hold the biga for up to about 3 days with no problems. Remove from fridge an hour or two before mixing the final dough to get rid of the chill. Or, just adjust your water temperature to counteract the cooled biga (I prefer just to let it warm up on it's own).

Final Dough
170 g biga
340 g bread flour
184 g water
146 g sweet potato
14 g unsalted butter
7 g salt
3.4 g instant yeast (just shy of a tsp)
102 g sweetened dried cranberries
64 g Walnuts
zest of 1 orange

Bake or boil the sweet potato until soft, then peel and mash. Mix the butter in while mashing, and allow the mixture to cool completely. Combine flour, biga water, yeast, salt, orange zest, and the sweet potato/butter mixture and mix to form a fairly shaggy dough.

NOTE: you can substitute some or all of the water out for orange juice.

Knead until very smooth and somewhat elastic, about 10-12 minutes. Then add the cranberries and walnuts and mix at low speed or incorporate by hand. Proof until roughly doubled, 2-3 hours.
Divide and shape the dough. This is enough for two smallish boules, a shade over 500 g each. Rolls would also be nice.  Proof again about 45-90 minutes, until roughly doubled (careful of over proofing though). I proof boules freestanding on parchment directly on a sheet pan, covered loosely with plastic wrap.  Preheat the oven to 400°F, no steam or stone is necessary. Also, this bread does not benefit from scoring.

Bake the loaves on a sheet pan for 20 minutes at 400°F, and then rotate the pan for even baking. Bake for an additional 10 minutes. Remove when they're nice and golden all over, sound hollow, and reach at least 190°F in the center. Cool about an hour.