1 For syrup, in a saucepan combine grapefruit juice, sugar, and cinnamon.2 Bring to boiling; reduce heat. Simmer, uncovered, for 5 minutes. 3 Discard cinnamon; cool syrup. Cover and chill syrup.4 To serve, fill four 8-ounce glasses with ice.5 Add about 1/3 cup grapefruit syrup to each glass. 6 Fill glasses with ginger ale. 7 Stir gently. If desired, garnish with Florida grapefruit peel curls, edible flowers, and fresh mint springs.