Place the chopped onions, spinach, and salt in a pot with ¼ cup of water. Saute over high heat for 5-7 minutes or until the spinach and onion are soft. When it is ready, leave it aside to cool.
Meanwhile, in a large bowl mix the dry ingredients for the dough (whole wheat flour, yeast, salt, and sugar).
Fold the warm water into the dry mixture. Using a spoon mix everything well.
Add the cooled spinach and onion filling and stir well until a well-combined dough is formed.
Line a round baking pan with parchment paper and transfer the dough into it. Sprinkle with some unhulled sesame seeds.
Cover and leave to a warm place for about 30 mins to rise.
While the dough is rising, preheat the oven to 350°F (180°C).
When the dough has reached twice its volume, bake it for 40-45 mins.
Let it cool down before eating.