Use a large mixing bowl or the kitchen counter to work on the dough.
Combine rye flour, wheat flour and couscous.
Add salt, instant dry yeast, sourdough powder, flaxseeds and sunflower seeds.
Mix well.
Add lukewarm water and knead it into a smooth dough. Knead for 5-7 minutes.
Then, round the dough and place it on a baking tray.
Brush water on the surface and sprinkle flaxseeds and sunflower seeds. Press them a bit so they stick to the dough.
Rest the dough in a warm place till it doubles in size.
Preheat the oven to 220 degrees C for 10 minutes.
When the dough doubles, place it in the oven and bake it for 50-60 minutes.
Then, remove it from the oven and let it cool on a wire rack.
Once cooled, slice and serve.