Finely cut onion and stew on a little water and then add the finely chopped white meat and let all together to stew a little bit more. During this time, divided a zucchini in half, lengthwise, hollow halves, a content that is removed can be added to meat and onion. Then fill the zucchini prepared meat, a top line up of tomato slices. Bake in the oven for about 20 minutes.