01 - Combine grape juice, sugar, cinnamon stick, lemon zest, and vanilla extract in a large saucepan. Bring to a gentle simmer over medium heat, stirring until sugar completely dissolves.
02 - Add pear halves to simmering liquid. Reduce heat to low, cover, and poach for 20-25 minutes, turning occasionally, until pears are tender but maintain their shape.
03 - Transfer pears to a serving dish using a slotted spoon, leaving poaching liquid in the saucepan.
04 - Increase heat to medium-high and simmer poaching liquid uncovered for 5-7 minutes until slightly reduced and syrupy consistency is achieved.
05 - Pour warm syrup over pears. Cool to room temperature or refrigerate until chilled. Serve with additional grape syrup and garnish with fresh mint, whipped cream, or vanilla ice cream if desired.