Herbed Asparagus Soup

Directions

1. In a large saucepan, saute onions and garlic in butter. Add the broth, asparagus, salt, thyme, pepper and bay leaf. Bring to a boil. Reduce heat; cover and simmer for 8-10 minutes or until asparagus is tender. Drain asparagus, reserving cooking liquid. Discard bay leaf. Cool slightly.
2. In a food processor, combine asparagus and 1/2 cup cooking liquid; cover and process until smooth. Return pureed asparagus and remaining cooking liquid to pan.
3. Combine the flour and water until smooth; stir into soup. Bring to a boil; cook and stir for 1-2 minutes or until thickened. Garnish each serving with sour cream and lemon zest.