How to make
First you need to feed the sourdough and let it activate for 1-2 hours.
Pour 3.5 oz (100 g) of the sourdough into a bowl. Add the water and both types of flour, by gradually knead a smooth dough. Kneading lasts about 15 minutes.
Cover and let the dough rest for about an hour. Then knead again for 15 minutes, by adding the oil and salt while kneading.
Form a loaf of bread and using a sharp knife, make slits on its surface. Sprinkle it with flour and transfer it into a tray lined with baking paper.
The rising time depends on the strength of the sourdough. In this case, it took about 8 hours for the bread to almost triple in volume.
Heat the oven to 390°F (200°C). Bake the whole grain bread for about 15 minutes and reduce the heat to 360°F (180°C). Bake for another 30 minutes.
Let the bread cool on a wire rack and slice it while still warm.
The bread with sourdough and two types of flour is ready.