We need:

Chicken broth (or beef bouillon), 3-4 tomatoes, 3 potatoes, 1 vegetable marrow (if it is possible to find it in supermarkets), 1 sweet pepper, 1 carrot, 1 onion.

Method of cooking:

Fist of all, we cut an onion and fry it, using olive oil.
Then we pour chicken broth in a pot and put fried onion there. We peel tomatoes, potatoes, a carrot, a marrow, a sweet pepper. All ingredients, except tomatoes, we cut in cubes and put in the pot. As for tomatoes, we cut them in cubes too and stew on a frying pan. After that we can put tomatoes in the pot. Salt and pepper our soup. It is ready when potatoes are ready.
Before serving out, it is better to add some grated cheese and cut dill, parsley and green onion in every plate.
This soup is low-fat and low-caloric.