Mix together 3 cups of flour with the starter and water.
Make sure everything is evenly blended
Cover at room temperature for 4 hours
Refrigerate overnight
Add the remaining flour and salt.
Knead to form a smooth dough
Cover and leave in a warm space for 1 hour
Stretch and fold each edge into the center, in quarters.
Return to the bowl and cover again.
Repeat this process 3 more times
Divide the dough in half
On a flour-dusted surface, pat each half, stretching the outside edges and folding them toward the center.
Continue around the dough edges until they’re all in the center
Turn the seam face down
Cover and rest for 15 minutes
Shape the bread into a circle (for a Dutch oven)
Transfer the loaves to two separate parchment papers
Leave them to rise for 4 hours
Slash the dough, making an X
Heat your Dutch oven while preheating - to 450F
Remove from the oven
Slide the parchment holding the one piece of dough into the Dutch oven
Put the other in the refrigerator until you’re ready to cook it.
Cover and cook for 30 minutes
Uncover for 10-12 minutes
Let cool before slicing.