Add the remaining 450 g of flour and 290 g of water and the salt and knead well for 10 minutes by hand or by machine on the lowest setting.
Put the dough in a bowl and cover the bowl with a shower hat or plastic wrap and leave on the counter for 6 hours.
Stretch and fold the dough every hour during that time (this is important to do if you want holes). To do that simply pinch the edge of the dough, stretch it up and fold it over the rest of the dough. Don’t press it down, just lay it down. Work your way around the edge of the dough, stretching and folding 4-6 times.
That’s it. Then, cover the dough and let it sit for another hour.
Stretch and fold the dough one last time and then shape it into a ball. Flour the top generously and place it floury top side DOWN in a well floured, 1 kg, round rising basket.
Cover it with the shower hat again and let it rest 2-4 hours until it passes the probe test.
Preheat the oven to 230 degrees celsius.
Line a baking tray with parchment and gently turn the dough out of the basket.
Pop it in the oven and bake for 10 minutes and then lower the temperature to 200 degrees celsius and bake for a further 30 minutes.
Remove the dough from the oven and let it cool completely on a wire rack.