Mix all ingredients in a large bowl and lightly knead into a ball.
Cover with plastic wrap and leave to rise at room temperature overnight, 8-12 hours.
After rising, carefully stretch and fold the dough 4-5 times into a smooth ball.
Turn dough out onto a lightly floured surface. Shape into a boule and place onto a piece of parchment paper and let rise again for 1 hour.
Meanwhile, place a dutch oven with a lid into the oven. Preheat oven to 450°F.
Once preheated, remove dutch oven from the oven. Score the loaf as you like and carefully lower into the dutch oven with a lid.
Bake in oven with lid for 30 minutes, then remove lid and bake for 10-15 more until the crust has browned.
Remove loaf from dutch oven and place on a cooling rack for at least 20 minutes before slicing.