Crumble the yeast into a mixing bowl or a dough basin.

Pour the water over the yeast and stir with a hand whisk until the yeast is dissolved.

Add salt, sugar, and oil to the yeast liquid.

Add the whole wheat flour to the mixture and stir well until everything is combined.

Now add the wheat flour little by little until the dough is smooth but not dry.

Knead the dough well.

Place a damp tea towel or a shower cap over the bowl and let the dough rise for 5 hours.

Shape the dough into a loaf and place it on a baking sheet lined with baking paper. 

Let the bread rise again for 1 hour.

Score a pattern into the bread and dust with flour.

Bake for 10 minutes at 250 degrees Celsius (482 degrees Fahrenheit) convection and then for 20 minutes at 210 degrees Celsius (410 degrees Fahrenheit) convection.