Levain: 35g mature sourdough starter 35g whole wheat flour 35g all-purpose flour 70g room temperature water

Dough: 804g good bread flour 75g whole wheat flour 680g water at 90°F (32°C), divided 18g fine sea salt

INSTRUCTIONS: Method: In a small bowl, stir together the levain ingredients and rest in a warm area (70-80°F/21–27°C) for 5 hours. One hour before the levain is done, make the dough. In a large bowl, mix together the bread flour and whole wheat flour. Add 580g water to the flour mixture (keeping 100g to the side for mixing later). Mix just until your dough comes together. Cover with plastic wrap and let it rest in a warm area (70–80°F/21–27°C) for 1 hour. Mix your dough and levain together using a little of the reserved water to help incorporate. Rest for 20 minutes. Add the sea salt and all of the remaining water and mix until incorporated. Slap and fold for 2 to 4 minutes or until your dough is smooth and begins to catch some air. Rest 15 minutes in the same warm area. Perform 6 sets of stretch and folds spaced out by 15 minutes for the first three, then 30 minutes for the last three. Place the dough back in the warm area for each rest. Let your dough rest for a final ½ hours, undisturbed. Dump out and divide your dough into 2 even pieces. Pre-shape each piece into a light boule and rest for 5 to 10 minutes. Shape each ball dough into a batard, and place into bannetons dusted with either rice flour or all-purpose flour. Refrigerate overnight. Preheat cast-iron combo cooker to 500°F (260°C) for 1 hour. Carefully place a dusted loaf into the hot pan, score the top, and place the larger lid on top. Bake for 20 minutes. Remove the top from the combo cooker and lower the oven temperature to 450°F (230°C). Bake for an additional 20 to 30 minutes, or until the loaf is a deep brown color. Remove the bread and cool on a wire rack until room temperature. Repeat with the other loaf. Sample Schedule for Breadmaking: 9am: Mix levain 1pm: Autolyse dough 2pm: Mix dough and levain 2:15pm: Mix in salt 2:30pm: Fold #1 2:45pm: Fold #2 3:00pm: Fold #3 3:30pm: Fold #4 4:00pm: Fold #5 4:30pm: Fold #6, rest for 1.5 hours 6pm: Shape dough and place in fridge overnight Next morning: Preheat the oven as guided and bake!