Grate the zucchini and onions using the large holes of a box grater. Wrap them in a clean kitchen towel and squeeze well to remove the excess liquid.
Step 3
Mix the zucchini and onion with the remaining ingredients and pour into a greased 9x13-inch pan, in an even layer. Bake uncovered in the oven until the pashtida is golden brown with dark edges, 35-40 minutes.
Step 4
Remove the pashtida from the oven and let cool for 30 minutes before cutting a piece, topping it with a dollop of labneh, fresh oregano leaves, a sprinkle of sumac, and tomato seeds.