Step 1

In a large plastic container mix together 600 grams of whole wheat flour and 600 grams of water that is 93° to 95° just until combined. Rest uncovered for 2 to 2 ½ hours then cover and keep in a warm place (70° to 90°) for 20 to 24 hours.

Step 2

Remove 2/3 to ¾ of the mixture and discard. Add 600 grams of whole wheat flour and 600 grams of water that is 93° to 95° to the young levain and mix just until combined. Rest uncovered for 2 to 2 ½ hours then cover and keep in a warm place (70° to 90°) for 20 to 24 hours.

Step 3

Repeat step 2 in its entirety.

Step 4

Remove all but 250 grams of the levain and discard. Add 600 grams of whole wheat flour and 600 grams of water that is 93° to 95° to the young levain and mix just until combined. Cover and keep in a warm place (70° to 90°) for 20 to 24 hours.

Step 5

Remove all but 150 grams of the levain and discard. Add 480 grams of white flour, 120 grams of whole wheat flour, 480 grams of water that is 90° to 92 and mix until combined. Cover and keep in a warm place (70° to 90°) for 20 to 24 hours and it is ready to use within 8 to 8 1/2 hours.

Step 6

Continue feeding every day!