Cream of Carrot Soup

Description
In Romanian: Supa de morcovi (crema)

Ingredients

 * 3 qts / 3 l water
 * 1 lb / 500 g carrots
 * 1 onion
 * ½ teaspoon sugar
 * 1 tablespoon butter
 * ½ cup sour cream
 * salt
 * cubed toasted bread

Directions

 * 1) Julienne the carrots and onion and set to boil until the carrots are tender.
 * 2) Strain, then sieve the carrots and onion.
 * 3) Add the puree obtained this way to the strained liquid and set to boil again, with the sugar, salt and butter.
 * 4) Let boil for a few minutes and then add sour cream when serving.
 * 5) Serve with croutons.