Danish Green Tomato Soup

Danish Green Tomato Soup

1/4 c butter
2 sliced onions
8 green tomatoes, cut into chunks
1 cup chicken or beef stock
1 tbsp arrowroot
1 c milk
sea salt to taste
ground black pepper
1 tsp sugar
sour cream or yogurt
chopped chives or dill weed

Melt the butter in a heavy skillet and sauté onions and green tomatoes until soft but not brown. Puree in a blender or food mill. Add the broth. Blend the arrowroot with the milk and add to tomato mixture. Bring to a boil, stirring constantly until mixture thickens. Season with salt, pepper and sugar.
Serve topped with sour cream or yogurt and chopped herbs. May be served chilled or warm.