Sourdough ciabatta (ish)

What do.

60% bread flour 40% wholemeal 82% water 12% starter 3% evoo 3% sugar 2.5% salt

Improved mix with all water. 1 hour rest. Add salt oil sugar mix to full development. Folded a couple of times and left to rest overnight at 17°c. Cut into pieces and baked hot at 250°c for 15 minutes with a little steam.