400 grams Sourdough Starter
500 grams lukewarm bottle water
700 grams bread flour or unbleached white flour
100 grams of Rye and spelt flour
22 grams salt
Mix the flours , starter and water together in a container with a lid, let rest for 30 minutes.
Added the salt and done the pinch and fold, until their is no more salt (wet hands) while mixing..
Do one stretch & fold and cover with lid , refrigerator overnight.
Cut and shape while dough is cold and cover with a very large cloth and dust with flour top and bottom (let rise for 1 to 1 1 / 2 hours.
Preheat oven at 500F. With a pizza stone and bake for 10 minutes on one side and 10 to 15 minutes the other side.
( Put a small baking pan on the lower rack with 1 cup of hot water for steam ).
Starter after rising ....