Sour Soup with Green Beans

• 2 qts/2 l water
• 10 oz/300 g green beans
• 1 onion
• 1 carrot
• 1 parsley root
• 1 lb/500 g tomatoes
• 1 tablespoon butter
• 1 teaspoon flour
• 1/2 cup sour cream or yogurt
• chopped parsley and dill
• salt

Fry the finely chopped vegetables in butter, with the flour. Add the water, add the cut beans, salt and let boil at low temperature until the beans are tender. Add the boiled and drained tomatoes and let boil until completely done. Add chopped parsley and dill. Mix some sour cream in it when serving.