This is an overnight rise, so the night before you want your bread combine the dry ingredients together in a large bowl and mix well.
Add your lukewarm water and stir to combine everything into a dough.
Cover with plastic wrap and set aside in a draft-free spot and let rise overnight for 12 hours (up to 20 hours) on the countertop
The next day (after at least 12 hours), Uncover the dough. It should be sticky, and bubbly and slightly wet on top.
Line your pan with parchment paper and sprinkle it generously with flour
Flour your countertop and your hands well and remove the sticky dough out onto the well floured counter.
If you are making one large loaf, then shape the dough into a large loaf and transfer it to your parchment lined AND well floured sheet pan. You can re shape the dough at this point after transferring. Sprinkle a generous amount of flour on the top of the loaf, then score the top with a sharp knife or blade, creating slits down the length of the dough. Cover and let rise in a warm spot for an additional 1-2 hours.
If you are making baguettes, once the dough is on the counter, split it in half with a sharp knife and form into two long and skinny loaves, then continue as above.
When the second rise time is nearly done, preheat your oven to 450°F
In order to get a crusty exterior it helps to have moisture in the oven. You can do this by adding about 2 cups of hot water to a pan and placing it in the oven on the rack below the rack you will cook your bread on.
After 10 minutes you can remove the water pan and continue baking the bread for another 30 minutes or until golden brown.