Wash the spinach in several waters, put it in a covered saucepan on a good fire. Stir now and then to prevent burning, and after fifteen minutes add one tablespoon of salt. Cook five minutes more; drain and squeeze out the water. Then chop up very fine. Put into a saucepan one generous tablespoon of butter, three-quarters tablespoon of flour, stir, and when they are half cooked, add the spinach and a little salt and pepper. Cook for five minutes, then pour in four or five tablespoons of cream, stirring constantly to prevent burning. Take a cup of spinach, prepared as above, beat up the yolk of one egg, mix it with the spinach, and stir over the fire until the egg is set; then let it cool, and before serving stir the well-beaten whites of three eggs lightly into it. Fill china cups or buttered papered forms half full, put them into a hot oven for ten or fifteen minutes, and serve at once. If too little baked or not served at once, the souffle will be spoiled.