Cut the eggplants into round slices and salt them. After straining out their bitter juice, rinse and dry them.
Clean the tomatoes and parboiled potatoes and cut them into circles too. Grease a tray and begin to arrange a row of potatoes, row of tomatoes, row eggplant, sprinkle with spices as desired, some walnuts and feta cheese.
Once you run out of products, trickle in oil and top it with 1 cup hot water. Put everything to bake until the water evaporates.