Start by measuring out, with your kitchen scale, your raisins in a small bowl and covering the raisins in hot water. You want the raisins to soak for at least 15 minutes.
While the raisins are soaking, in the bowl of a stand mixer or a large mixing bowl, combine the starter, water and brown sugar. Mix this by hand until a slurry is formed.
Next add the flours and mix with the dough hook attachment or by hand until a shaggy dough forms. At this point you will let your dough rest or fermentolyse for 30 minutes.
After the dough resting time is over add the raisins (be sure to drain the excess water off), cinnamon and salt. Knead for 6 minutes. The dough will come together and pull away from the bowl.
Next, transfer the dough to a greased mixing bowl and cover with a tea towel. Let rest for 30 minutes and then complete one stretch and fold on the dough.