Cream of Carrots Soup

Description
In Romanian: Supa de morcovi (crema)

Ingredients

 * 3 qts/3 l water,
 * 1 lb/500 g carrots,
 * 1 Onion,
 * 1/2 teaspoon Sugar,
 * 1 tablespoon butter,
 * 1/2 cup sour cream,
 * salt,
 * cubed toasted bread

Directions

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