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1
Begin by thinly slicing one of the oranges, cut the slices in half, and set aside to be used as garnishes.
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2
Slice the remaining orange in half, cut one half into thin slices, and set aside for later use.
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3
Carefully remove the outer peel from the remaining half of the orange and place it in a large bowl.
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4
Add the sugar and mash it into the orange peel to help release the flavorful oils from the peel.
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5
Add the wine, orange juice, white grape juice, and Cointreau, and stir well to combine.
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6
Cover and chill in the refrigerator for 30 minutes or more to allow the flavors to blend.
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7
Remove the orange peel and discard it.
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8
Transfer the mixture to a large pitcher and add the reserved whole slices of orange.
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9
Serve in tall ice-filled glasses and garnish each with a half slice of orange.
