Mix all ingredients in the bowl of a standing mixer.
With the dough hook attached, kneed for 10-15 minutes. You will know your dough is ready when it's soft, supple & stretchable.
Transfer to an oiled bowl & cover with plastic wrap or damp towel.
Let rise in a warm spot - preferably a fermentation box, set to 27 degrees C (80 degrees F) for 5-7 hours.
Check periodically to see how well the bread has risen.
When the dough has doubled, turn it out onto a floured surface.
Divide into two. Let the other half of the dough rest while you work the first.
Fold the dough onto itself, then pull out the edges and fold them in. Lastly, spin the loaf towards you to create surface tension.
Place in a floured banneton basket seam side up.
Place the banneton basket with your dough inside into a big plastic bag, tie it off, and place it in the fridge for the final rise.
Leave loaves in the fridge overnight.
Next day, place your Dutch oven into the oven and preheat for an hour at 250C (500F).
When the oven is preheated, turn one banneton basket out onto a large piece of baking parchment
Now the fun part! Score your sourdough loaf!
Carefully lift the baking parchment with your loaf and place it inside the preheated Dutch oven.
Bake for 20 minutes with the lid on.
Lower the temperature to 235C (450f), remove the lid, and bake for another 15-20mins uncovered.
Carefully remove the Dutch oven from your oven, and using the baking parchment take the loaf out.
Allow to cool on a cooling rack