01 - In a large saucepan, combine the grape juice, sugar, cinnamon stick, lemon zest, and vanilla extract. Bring to a gentle simmer over medium heat, stirring occasionally until the sugar completely dissolves.
02 - Add the prepared pear halves to the simmering liquid. Reduce heat to low, cover the saucepan, and poach for 20 to 25 minutes. Turn the pears occasionally during cooking to ensure even poaching. Cook until tender but still holding their shape.
03 - Using a slotted spoon, carefully transfer the tender pear halves to a serving dish, leaving the poaching liquid in the saucepan.
04 - Increase the heat to medium-high and simmer the poaching liquid uncovered for 5 to 7 minutes, or until the liquid has reduced slightly and achieved a syrupy consistency.
05 - Pour the warm reduced syrup over the poached pears. Allow to cool to room temperature or refrigerate until chilled. Serve with additional grape syrup drizzled over the top and garnish with fresh mint, whipped cream, or vanilla ice cream if desired.