Brown the beef on all sides in the oil in a skillet; drain. Melt the butter in a saucepan. Stir in the flour. Cook until smooth and bubbly, stirring constantly. Stir in the broth gradually. Cook until thickened, stirring constantly.
Add the carrots, onion, celery, potato, Kitchen Bouquet and pepper to the broth mixture and mix well. Bring to a boil; reduce the heat. Simmer for 5 minutes, stirring occasionally. Add the beef and tomatoes and mix gently. Simmer, covered, for 10 minutes or to the desired consistency, stirring occasionally. Taste and adjust the seasonings. Ladle the stew into bowls. You may substitute 1 cup dry red wine for 1 cup of the broth.