Chop the grapes, strawberries and mango into bite-sized pieces and place in a bowl.
Quarter the oranges and juice them into a pitcher or drink dispenser.
Do not discard the oranges and set them aside in a bowl with the other chopped fruit.
Add the chilled wine, two ounces of Grand Marnier and ½ cup of sugar to the orange juice.
Stir all ingredients with a large spoon.
Add the chopped fruit and oranges to the wine mixture and chill for 12-24 hours.
Once the sangria mixture has chilled, add ½ of a liter of chilled ginger ale and mix well.
The sangria is now ready!
Use a ladle to scoop the bite-sized fruit and sangria to each wine glass.
Slice a star fruit to garnish the wine glass rim.