Kidneys with Sour Cream

Description
In Romanian: Rinichi cu smantana

Ingredients

 * 1 beef or 2 veal or pork kidneys (approx 1¼ lbs / 600 g)
 * 1 small onion
 * 1 tablespoon butter
 * 1 cup sour cream
 * 1 level teaspoon flour
 * ½ cup meat broth
 * salt

Directions

 * 1) Remove the outer membranes from the kidney, split in half lengthwise, remove all fatty tissues inside, slice thinly and set to boil starting with cold water.
 * 2) After coming to a boil, drain and wash well with tepid water.
 * 3) Fry the onion with the butter until yellow, add flour, mix, then add meat broth.
 * 4) To this sauce, add sour cream, salt and kidney pieces.
 * 5) Simmer until the kidneys are done.