Wash and chop the zucchini into small cubes, without peeling the rinds.
In the tray you intend to bake the moussaka, mix the zucchini cubes, mince, finely chopped onions, finely chopped tomato.
Stir all the ingredients well and season with the spices. Pour in 1/3 cup water and bake in a preheated 392°F (200 °C) oven about 45 min.
For the topping, beat the eggs in a bowl, add the sour cream and flour. Season with salt to taste. Stir to a homogeneous mixture.
Once the moussaka is ready, distribute the topping on evenly. Place the moussaka in the oven again to bake to a nice crisp.