Mix the levain at least 12 to 16 hours before you plan to mix the dough
Combine all levain ingredients and let stand covered at about 70 degrees F
At the same time, mix the soaker by mixing all of the grains in a bowl, and pour boiling water on top. cover with plastic wrap and let stand at room temperature
To make the dough:
Add all of the ingredients to a standing mixer and mix on low speed for 2.5 minutes and then low-medium speed for 4 to 5 minutes. the final dough temperature should be 76 degrees
Bulk ferment for 1 to 1.5 hours (fold once at 45 minutes if fermenting for 1.5 hours)
Divide and shape into 1.5 pound pieces and place into bannetons and cover with towel or plastic wrap
Final fermentation is 1 hour at 76 degrees (or you can refrigerate overnight; if refrigerating, bulk fermentation should be extended to 2 hours and commercial yeast should be left out of the mix).
Bake day:
Preheat oven at 500 degrees for at least 30 minutes with dutch oven inside placed on baking stone
When ready to bake, load loaf into dutch oven, score the top with lame or razor, and reduce heat to 460 degrees
Bake bread for a total of 40 to 45 minutes (covered for the first 20 minutes)