How to make
If you don't have sourdough, you can make it yourself by mixing water and flour into a thick paste.
Pour it into a jar and leave it at room temperature, by not closing the cap completely. The next day feed the yeast with water and flour and by 2-3 you will see bubbles appear.
Feed it again with water and flour (in the same amount). However, this last feeding should be immediately before the bread is made, so that the sourdough is fresh.
Mix the whole wheat flour with the sourdough and the water. Knead for about 10 minutes. From time to time sprinkle a little flour or grease your hands, so that you can knead more easily.
Put the finished dough in a bowl and leave it to rise for about an hour. Knead it once more, by now adding the salt to it.
Leave it to rise again - this time for at least 6-8 hours and the time depends on the strength of the sourdough itself. You can also store it in the refrigerator for the night.
Knead the dough briefly and shape it into a round whole wheat bread.
Cover a baking tray with paper and put the bread in it. With a sharp knife, make cuts on its surface and sprinkle it with a little flour. Cover it with a towel and leave it to rise for 2-3 hours.
Heat the oven to 390°F (200°C). Bake the bread for 15 minutes and then reduce the temperature to 360°F (180°C). Bake for about half an hour, or until it aquires an appetizing color.
The whole wheat bread with natural sourdough is wonderful!