If desired, thread grapes on a decorative toothpick or short skewer; set aside. Fill a cocktail shaker with ice. In cocktail shaker combine grape juice, whiskey, Maple Simple Syrup, and lemon juice. Cover and shake about 10 seconds or until cold.
Strain into a highball glass and garnish with concord grapes.
Maple Simple Syrup
In a small saucepan simmer maple syrup and water for 10 to 15 minutes or until syrupy. Cool completely. Makes enough for four drinks.