Day 1, Mix the Dough and Autolyse: In a bowl add the flours and sift the cocoa powder in to avoid clumps then whisk to combine. Add the water and use a spatula or dough whisk to mix the dough until no dry bits of flour remain. Cover the bowl with plastic wrap and autolyse for one hour. (Dough temperature: 77ºF)

Add Starter: After one hour add the starter and incorporate into the dough by folding or kneading it in. Cover with plastic wrap and let sit for 30 minutes.

Add Salt and First Stretch and Fold: After 30 minutes add the salt by sprinkling it over the dough and dimpling it in with your fingers (better to wet your hand for this to prevent the dough sticking). You can further incorporate the salt by using this stage to perform your first stretch and fold session. Cover and let sit for 30 minutes. (Dough temp: 77ºF)

Perform a second stretch and fold after 30 minutes then cover and let sit again for another 30 minutes.

Lamination: Carefully turn the dough out on your counter that has been lightly misted with water. The topside of the dough when it was in the bowl will be the bottom when turned out on the counter. Using wet hands carefully take a piece of the dough and pull it gently moving your hands so they're supporting the dough from the bottom. Pull gently from all around the dough until you have a flat, rectangular sheet of dough. Sprinkle about 2/3 of the chocolate chips, raisins and walnuts evenly across the top. Take two sides of the short edge of the rectangle and fold it 2/3 of the way over. Sprinkle half of the remaining add-ins on the folded piece of the dough and take the other short edge and fold over. Sprinkle the remaining add-ins on the top then fold this piece in thirds again. Transfer the laminated dough seam side down on a square casserole dish, cover with plastic wrap and let sit for 30-45 minutes. (Dough temp: 77ºF)

Coil Folds: Using wet hands pick up the dough from the center on each side and lift until one portion of the dough separates from the casserole dish and tuck it under the rest of dough. Rotate and repeat on the other side. Doing this twice. Repeat this coil fold session every thirty minutes until you see your dough gaining more structure between folds. Three coil folds were performed for the loaf pictured here. (Dough temp: 79ºF)

Bulk Fermentation: After the last coil fold allow the dough to finish bulk fermentation until it has grown by 30-50%. At temperatures I've noted here the total bulk time for my loaf was five hours and 45 minutes from the time I added the starter. (See note) It may take a little longer or less time depending on your starter and the temperature in your kitchen. Just watch for bubbles on top of the dough and it should look lighter and airier with rounded edges.

Shape and Cold Retard: Dust your banneton (round or oval)with rice flour. Turn the dough out on a lightly floured surface (all purpose or bread flour). The top of the dough now becomes the bottom. Gently pull the dough to flatten it a little, fold in thirds and roll into a ball. Transfer the dough to the banneton seam side up, pinching the seams together. Cover with a plastic bag and refrigerate overnight.

Day 2, morning, Bake. Put your dutch oven with the lid on in your cold oven and preheat to 475ºF. When your oven has reached temperature take your dough out of the refrigerator and flip it over on the counter lined with parchment paper. I like to use a small cutting board for this step (parchment paper between the banneton and the board) to make it easier to flip the dough out. Brush the excess flour from the top of the dough and score. Put on your oven mitts and take your dutch oven out of the oven. Remove the lid and gently lay the dough in the pot using the parchment paper. Cover, return to oven and bake for 30 minutes. Remove the lid and bake for another 15 minutes. Cool on a wire rack for at least three hours before slicing.