Clear Vegetable Soup

Procedure

1. Heat the butter in a heavy saucepot over medium-low heat.
2. Add the onions, carrots, celery, and turnip. Sweat vegetables in the butter over low heat until about half cooked. Do not let them brown.
3. Add the stock. Bring to a boil and skim carefully. Simmer until vegetables are just barely tender.
4. Add the tomatoes and simmer