Pour some black sugar into a small, shallow dish. Run a slice of orange around the top of a rocks glass. Dip the rim in the sugar to coat the top of the glass. Fill with ice and set aside.
Combine grape juice, orange juice, simple syrup, and lime juice in a cocktail shaker filled with ice.
Shake well and pour into your prepared glass.
Top with ginger ale.
Garnish with a slice of orange and/or a few red grapes.