Clean and wash sorrel, cook the sorrel in its own juice, and rub through a fine sieve. Boil spinach or young beet greens in salted water until tender, finely chop, and mix with the sorrel. Add a couple of cubed cucumbers, dill, green onions, greens, salt, and fine sugar or treacle. Dilute with sour shchi and add ice. Cook a fresh salmon (lososina ili semga), white salmon, or whitefish in boiling water and add the fish to the soup when serving at the table. Serve with grated horseradish. Sherry or champagne may be added and also crayfish tails.