Bring the water to a boil with the half onion and tomato.

Wash the chicken well.

When the water boils, add the chicken and cook for 20 minutes. Skim off any fat that rises to the surface with a spoon.

Add the chopped carrots, quartered potatoes, and rice to the soup.

When the rice is tender, add the chopped zucchini, chicken bouillon cube, salt, and a sprig of oregano. Cook for a few more minutes, then turn off the heat.