Peel and chop the onions. For the spinach, sauté half the onions in 1 tbsp. hot oil. Add the frozen spinach and 7 tbsp. water, cover and steam for about 10 minutes until the spinach is defrosted. Then continue to cook open for about 6 minutes until all the liquid has evaporated.
Season with salt, pepper and paprika. Let spinach cool down briefly, then chop coarsely.
For the chopping mass, wash and chop the tomatoes. Fry the chopped tomatoes in 1 tbsp. hot oil until crumbly. Fry the rest of the onions and tomatoes briefly. Stir in tomato paste. Season with salt, pepper and cumin.
Fold the long sides towards the middle so that the ends lie on top of each other and "boats" are formed. Press on well.
Crumble the feta and sprinkle on the spinach. Spread the edges of the dough with the rest of the oil, sprinkle with sesame seeds. Bake in a hot oven for 15-20 minutes.