Twenty Quick Soups by Sarah Tyson Rorer

Put three tablespoonfuls of cocoa into a double boiler, and add gradually one pint of boiling water. Stir for at least five minutes over the fire. Add four tablespoonfuls of sugar, take from the fire and add a teaspoonful of vanilla. Turn this into one pint of cracked ice, and when the soup is cold, turn into the serving cups, and put on the surface a tablespoonful of whipped cream, and serve.