Grate enough lemon peel to measure 1/2 tsp. zest. Squeeze enough juice to measure 4-1/2 tsp. Mix 1/4 cup granulated sugar, 2 Tbsp. flour and 1/2 tsp. cinnamon in large bowl. Add pears, lemon zest and juice; toss until pears are evenly coated. Spoon into 8-inch square baking dish.