Wash the plums. Do not peel. Cut in half, remove pits and boil with the sugar, cinnamon and water uintil plums are soft.
Put through a coarse sieve and heat again.
Mix the cornstarch with a little cold water and stir into the soupl Stir and let boil 5 minutes. Add the wine and remove from stove at once.
Serve hot or cold. If you wish to serve it chilled, top with whipped cream.