California Avocado Bisque Soup

Ingredients

 * 3 cups milk
 * 1 ½ tbsp chopped, fresh tarragon leaves (recommended) or ½ tablespoon dried tarragon leaves.
 * 1 tsp salt
 * 3 California avocados (1½ pounds)
 * 2 tbsp fresh lemon juice
 * large pinch cayenne pepper or to taste
 * sour cream as needed for garnish

Directions

 * 1) Combine milk, tarragon, and salt; heat until liquid just begins to simmer (do not boil).
 * 2) Remove from heat; let stand 1 hour.
 * 3) Meanwhile, puree avocado and lemon juice until smooth.
 * 4) When milk is ready, whisk avocado mixture into milk mixture.
 * 5) Stir in cayenne.
 * 6) To serve hot, heat until liquid just begins to simmer.
 * 7) To serve cold, chill at least 2 hours to marry flavors.
 * 8) Serve the soup the day it's made.
 * 9) Garnish each serving with a swirl of sour cream.