Biga
190 g high-extraction flour
114 g water
0.003 g salt (a tiny tiny pinch, basically a few grains)
0.003 g instant yeast (a tiny tiny pinch too)
Poolish
190 g organic white flour
209 g water
0.003 g salt
0.003 g instant yeast
Levain (mine was 40% whole-grain, mostly wheat and spelt with a little bit of rye)
380 g high-extraction flour
209 g water
190 g firm starter
Final dough
631 g high-extraction flour
353 g organic white flour
761 g water (I used slightly less water than JT, probably because my flours were less thirsty than the ones he used)
34 g salt
0.17 g instant yeast
305 g biga
400 g poolish
780 g levain
Method (this bread is made over two days)
- Mix the biga, the poolish and the levain and leave them to ferment at room temperature for 10 to 12 hours
- When the preferments are ready, mix flour, poolish and 80% of the water in the bowl of the mixer until the flour is completely hydrated and let rest for 30 minutes (autolyse)
- Add the biga, the levain, the yeast, the salt and remaining wateras needed and mix until the dough starts to develop strength, then add more water until medium soft consistency is reached (JT says: "A second water addition is used for this mix. I tend to prefer this style of mixing. Instead of holding back say 5-10% of the water and dribbling it into the bowl when you feel comfortable. I like to create the final dough and on the last minute throw all the water in one go. The dough will start to shred and start 'swimming'. Do not panic and add flour! It’s a bit like accelerating through a skid, Don't put your foot on the brake")
- Transfer the dough to an oiled container, cover it tightly
- Give it a fold after one hour then put the container in the fridge overnight
- In the morning, take the dough out of the fridge and give it a fold
- Let it come back to low room temperature and divide by 500 g, preshaping as cylinders or boules according to the desired shapes
- Shape and let proof, covered, for one to one and a half hour
- Pre-heat the oven to 470 F/243 C one hour before baking (my oven doesn't heat very well. A lower temperature setting might work just fine in your oven), taking care to put it in a baking stone and, underneath, a heavy metal pan for steaming (mine contains barbecue stones which we bought solely for steaming purposes)
- Dust with flour and score as desired (as can be seen from the above pictures, deep scoring and angled surface scoring yield very different "ears" in the final loaves)
- Pour a cup of water over the barbecue stones in the steam tray, lower the oven temperature to 450 F/232 C and bake for 40 minutes
- JT recommends turning off the heat after 30 minutes and leaving the bread an additional 15 minutes in the oven with the door ajar. I will try that next time as I found the crumb a little bit moist when I first sliced open one of the cooled loaves.

Related post: Meet the Baker: John Tredgold
JT's 85x3 goes to Susan, from Wild Yeast for Yeastpotting.