Fresh Tomato Soup Recipe

1 cup(2 stalks)chopped celery
1 small onion, chopped
1 carrot, grated
1/2 green pepper, chopped
1/4 cup butter
4-1/2 cups chicken broth, divided
1 quart fresh tomatoes, peeled and chopped
1/2 teaspoon curry powder
1/2 teaspoon salt
1/4 teaspoon pepper
4 teaspoons sugar
1/4 cup flour

Saute celery, onion, carrot and green pepper in butter in large heavy pan. Add 4 cups broth, tomatoes, curry powder, salt, pepper and sugar, heat to boiling. Reduce heat; simmer for 20 minutes. Blend flour with remaining 1/2 cup broth. Stir gradually into soup. Cook until slightly thickened, stirring frequently. Serve hot.