Chopped cleaned roots and onions. Stew them with a little salt in the butter. Add the flour and fry until light yellow color. Broth dilution with the mixture and boil about ten minutes. Once the sauce thickens remove it from the fire and zastroyvame with beaten egg and lemon juice. If we want the sauce to be more subtle, it strained it without scraping vegetables. Serve it in a sauce-boat and sprinkle with lemon drops.