Step 1

12 hours before you plan to mix the dough, add the ingredients to make ½ cup (100 g) of active sourdough starter to a clean jar. Stir until combined, loosely cover the jar and let the starter rise at room temperature. (The ingredients will create a total of 115 g active starter but, because some of it will stick to the sides of the jar during the transfer, we are making a little more than needed.) The sourdough starter is ready to use when it has doubled in size and there are plenty of bubbles on the surface and sides of the jar.

Step 2

Mix Dough Ingredients: Add the ingredients to a large mixing bowl. Use your hands to combine the ingredients until there are no dry bits and the dough looks like a shaggy mass. Cover the bowl and let the dough rest on the counter for 1 hour.

Step 3

Stretch and fold: Perform 3 sets of stretches and folds, 30 minutes apart. To perform a set, while the dough is still in the bowl, pick up one side with a wet hand. Pull it up and over itself. Turn the bowl and repeat this action on 4 sides of the dough until the bowl has come full circle. Cover the dough and allow to ferment at room temperature according to the following temperatures. 68 - 70°F (20 - 21°C) 2 - 2 1/2 hours72 - 75°F (22 - 24°C) 1- 1 1/2 hoursThe dough is ready for shaping when it has risen about 20-30% and has bubbles around the edges of the bowl.

Step 4

Shaping: Turn the dough out onto a lightly floured surface and use a bench scraper to form it into a loose ball. Cover and let rest for 20 minutes. Lightly flour the surface of the dough ball and use a bench scraper to turn it over. Final shape the dough by pulling the side nearest yourself up and towards the center of the dough. Repeat on all fours sides of the dough. Flip the dough over, seam-side down, and use your hands to twist the dough on the counter. Cup the dough with your hands and gently pull it towards yourself to create a tight skin on the outside. Flour the outside of the dough ball. Flour the inside of a banneton and place the dough ball into the banneton, seam-side up. Cover the bowl with a large plastic bag and let rest on the counter for 1 - 1/2 hours.

Step 5

Slow Cook: Lightly spray the inside of your slow cooker with cooking spray. Turn the dough out onto a piece of parchment paper and place it into the slow cooker. Turn the slow cooker onto the HIGH setting and allow to slow cook for 1 hour.

Step 6

Remove the lid, place a clean kitchen towel over the the top of the slow cooker and place the lid back on. Cook for 1 additional hour on HIGH.

Step 7

Cool: Check the internal temperature of the bread using a digital food thermometer. It is done when it registers at least 200°F (93°C). Remove the bread from the slow cooker and cool on a cooling rack for 2 hours before cutting. (If you would like a darker crust, place the bread under the oven broiler until it reaches desired color.)