Evening: Add all ingredients in a bowl and mix until combined. Cover with a towel and leave it overnight.
The next morning: Preheat oven to 230o C / 450o F and leave a baking pan in the oven while preheating.
Scrape the dough in a well-floured surface and form an oblong rectangle, approx. 10X40 cm.
Twist the rectangle lengthwise two or three times. Score the dough surface, diagonally, with a sharp knife 8 times.
Brush with water and sprinkle with sunflower seeds and flour.
Cover it with a towel and allow to rest until the oven is very well heated.
Having warm up the oven well, remove the pan and line it with parchment paper. Cut the dough into 8 pieces and place them in the pan.
Bake for 20-22 minutes, until you get this dark color you see in the photos.
Let cool on a rack.