Cream of Spinach Soup

Description
In Romanian: Supa de spanac (crema)

Ingredients

 * 3 qts / 3 l water
 * 1 lb / 500 g spinach
 * 1 lemon slice (with peel)
 * 1 tablespoon butter
 * 1 teaspoon flour
 * ½ cup sour cream
 * salt
 * French Toast

Directions

 * 1) Wash and pick over the spinach.
 * 2) Set to boil with the water.
 * 3) After boiling for a little while, remove from heat and sieve everything.
 * 4) Set to boil again, adding the lemon, salt and butter.
 * 5) Let boil for another minute or two, then add the sour cream mixed with flour.
 * 6) Serve with French Toast.