Cabbage Soup (Shchi)

Vegetarian
Russian
soup
Cabbage Soup (Shchi)
Unsalted Butter3 tbs
Onion1 large
Cabbage1 medium
Carrots1
Celery1
Bay Leaf1
Vegetable Stock8 cups
Potatoes2 large
Tomatoes2 large
Sour CreamGarnish
DillGarnish