Fresh Tomato Soup

Ingredients

 * 6 Tomatoes; medium size or
 * 2 lb Italian plum tomatoes
 * 1 Onion; chopped
 * 1 Celery; stalk, chopped
 * 2 c Chicken broth
 * 1 tb Tomato paste
 * 1/2 ts Basil
 * 1/4 ts Pepper
 * 1/2 ts Salt
 * 1/2 c Yogurt

Directions

 * Cut tomatoes and place in 1 1/2-quart saucepan with all ingredients except yogurt.
 * Simmer uncovered 30 minutes.
 * Adjust seasonings.
 * Garnish with spoonfuls of  yogurt.