Sort the spinach, wash and drain. Puree with 100 ml water using a hand blender. Mix 300 g flour and 2 tsp salt in a bowl. Add 4 tablespoons of oil, then gradually knead in the spinach water with the dough hooks of the mixer. Cover and let rest for about 20 minutes.
In the meantime, wash the tomatoes for the salad and cut them into small pieces. Wash the cucumber and cut into thin slices. Clean and wash the bell peppers and cut them into thin strips. Cut olives into slices. Wash herbs and shake dry. Pluck leaves from the parsley and chop. Cut chives into small rolls. Mix prepared salad ingredients with vinegar and 1 tablespoon of oil, season with salt and pepper.
Divide the dough into 8 portions. Roll out to thin round flat cakes (approx. 20 cm Ø) on a floured work surface. Brush a coated pan with a little oil and heat it up. Bake the flat cakes one after the other at medium heat from each side until the dough starts to bubble. Stack them on top of each other and keep warm. Heat 1 tablespoon of oil in the pan. Fry the gyros in it until golden brown all around. Crumble the cheese. Cover the flat bread with salad, gyros and cheese. Fold up or roll, arrange.