Put the flour in a bowl and crumble the yeast. Then add 450 ml of lukewarm water and knead. Gradually knead the vinegar, salt, linseed and sunflower seeds into the dough.
Grease a loaf pan and add the batter. Bake the bread for 60 minutes at 200 ° C top and bottom heat.
Take the bread out of the pan and bake for 8-10 minutes.