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 yogurt.