Weigh all the ingredients. Make sure the water is between 10 and 18˚C.
Dilute the yeast with a small amount of water and mix in the sourdough starter.
Mix the flour with the squid ink and water and leave to hydrate for 30 minutes.
Knead the dough for five minutes.
Add the yeast mixture and knead for another 5 minutes.
Add salt and knead for about 10 minutes more until you have an elastic dough.
Cover the dough with plastic foil and leave to rise for two hours.
Shape the dough into balls with a weight of 200 g and cover with plastic foil.
Now leave the dough to rest for 8 to 72 hours in the refrigerator.
We call this cold fermentation. The longer you let the dough ferment, the tastier and easier it will be to digest.