Combine 500 grams of bread flour with 1 envelope of instant yeast and a teaspoon of salt into a large bowl
Add 425ml of water and mix until a shaggy dough forms
Cover the bowl with plastic wrap and let the dough rest at room temperature for 2-3 hours
Transfer the covered dough into the refrigerator for between 12 hours and 4 days (or continue to the next step if baking same day)
When you are ready to bake the bread, place a metal deep baking dish on the lowest set rack in your oven, place the other rack in middle of your oven and begin preheating your oven to 450 degrees (with the empty baking pan inside)
While the oven preheats, transfer the dough out of the refrigerator and let it sit at room temperature for 15 minutes
Lightly flour your hands and transfer the dough onto a lightly floured surface and divide in half with a sharp knife or pastry cutter
Gently shape the dough into two rounds or oval shaped loaves adding flour to your hands when necessary
Lightly flour a sheet a baking sheet and transfer the shaped loaves onto the floured baking sheet
Cover the loaves with a light towel and let the dough rest for 30-40 minutes
Once the bread is ready to bake, use a very sharp knife or bread lame to score 2 or 3 shallow cuts into the top of both loaves
Right before placing the dough into the oven, add 1 cup of very hot water into the baking dish on the lowest rack of your oven
Transfer the loaves onto the middle set rack (keeping the oven door closed as much as possible during this process) and bake the loaves in the 450 degree oven for 25-30 minutes
The bread is fully baked when the interior temperature reaches 190 degrees and the loaves sound hollow when you tap on the under side
Allow the loaves to rest on a cooling rack for 30 minutes before slicing