For the stew soup with tomato flavoring, bring the soup to a hot boil. In a tall container, crack the egg and and beat well, gradually stirring in the flour.
Lastly, stir in the salt and tomato paste. Now take a demitasse spoon and drop in the batter by the spoonful. Bring to a boil for a few seconds until the flakes float to the top.
Before serving, sprinkle the fresh chives over the soup.