340 g strong white bread flour (You can use plain flour if you cannot get bread flour, but the crumb may not be as good.)
1 tsp salt
Method
1
Put the starter into a large mixing bowl and pour the tepid water over it.
2
Add the flour and salt
3
Use your hands or a large fork to pull the mixture together into a rough dough
4
You should have a sticky mixture. Cover it with clingfilm or a tea towel and leave for 8-10 hours to prove
5
Flour a board or worktop
6
Scrape the mixture out onto the flour and knock back (see notes) adding more flour as necessary. You want to end up with something that you can shape into a ball.
7
If you have a banneton, put the dough in there. If not, coat a tea towel or muslin with flour and put the dough ball into the cloth, then put the cloth into a rounded mixing bowl. Cover. One of the best ways to cover is with a (clean) shower cap - or clingfilm if not. If you want to bake within 3-4 hours, keep the dough at room temperature. If you need to wait for longer put the dough into the fridge where it will happily keep for a further 10-12 hours
8
If your dough has been in the fridge, let it come to room temperature while you pre-heat the oven to 225C. Put a large dutch oven into the oven to preheat at the same time
9
put a sheet of baking paper on a pizza slide and turn the dough out from the bowl onto the slide. Slash it a couple of times on the top to help to allow the bread to rise.
10
take the dutch oven out of the oven and carefully slide the dough into it.
11
Bake with the lid on for 25 minutes and then for a further 15 to 20 minutes with the lid removed.
12
Turn the bread out onto a wire rack and allow it to cool for at least an hour