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