Make a white sauce by putting the butter in a saucepan or double boiler. When melted add the flour, and cook a moment without browning. Then add slowly the milk, and stir till smooth. Season with salt, pepper, parsley, and onion juice. There should be one cupful of the sauce. Remove from the fire, and stir in the beaten yolks of three eggs; then add a cupful of chicken chopped fine. Stir the mixture over the fire a minute until the egg has a little thickened; then set aside to cool. Rub a little butter over the top, so it will not form a crust. When time to serve beat very stiff the whites of the three eggs, and stir them lightly into the cold chicken mixture. Put it into a pudding dish, and bake in hot oven for twenty minutes. Serve at once in the same dish. This is a souffle, so the whites of the eggs must not be added until it is time for it to go into the oven, and it will fall if not served immediately after it comes from the oven. This dish may be made with any kind of meat. Chicken souffle may be baked in paper boxes, and served as an entree.