Dissolve yeast in water, and add the sourdough starter and salt, then stir again.
Add the flour in two batches and mix it using a stand mixer.
Mix until the dough releases from the sides - this takes about 10-15 minutes.
Let the dough rest for 8-12 hours under a shower cap at room temperature. I usually make the dough in the evening and leave it overnight.
The next morning, turn the dough onto a floured surface.
Fold the dough over itself 4-5 times until it forms a tight loaf.
Place it in a proofing basket, seam side up.
Let the bread rest for 2 hours under a tea towel.
Preheat the oven and a baking tray to 250 degrees Celsius (482 degrees Fahrenheit) with a fan.
Turn the bread onto the hot baking tray and make a deep cut lengthwise on the top.
Bake the bread in the oven for 10 minutes at 250 degrees Celsius (482 degrees Fahrenheit) with a fan, followed by 20 minutes at 210 degrees Celsius (410 degrees Fahrenheit) with a fan.
Let the bread cool on a wire rack for about 20 minutes before slicing.
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